Some of the geometric formulas we take for granted today were first derived by methods that anticipate some of the methods of calculus. The Greek mathematician Archimedes (ca. 287—212; BCE) was particularly inventive, using polygons inscribed within circles to approximate the area of the circle as the number of sides of the polygon increased. He never came up with the idea of a limit, but we can use this idea to see what his geometric constructions could have predicted about the limit. We can estimate the area of a circle by computing the area of an inscribed regular polygon. Think of the regular polygon as being made up of n triangles. By taking the limit as the vertex angle of these mangles goes to zero, you can obtain the area of the circle. To see this, carry out the following steps: 2. Using the expressions that you obtained in step 1, express the area of the isosceles triangle in terms of θ and r . (Substitute (l/2) sin θ for sin ( θ / 2 ) cos ( θ / 2 ) in your expression.)

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Calculus Volume 1

17th Edition
Strang + 1 other
Publisher: OpenStax College
ISBN: 9781938168024
Chapter 2.3, Problem 2SP
Textbook Problem

Some of the geometric formulas we take for granted today were first derived by methods that anticipate some of the methods of calculus. The Greek mathematician Archimedes (ca. 287—212; BCE) was particularly inventive, using polygons inscribed within circles to approximate the area of the circle as the number of sides of the polygon increased. He never came up with the idea of a limit, but we can use this idea to see what his geometric constructions could have predicted about the limit.

We can estimate the area of a circle by computing the area of an inscribed regular polygon. Think of the regular polygon as being made up of n triangles. By taking the limit as the vertex angle of these mangles goes to zero, you can obtain the area of the circle. To see this, carry out the following steps:

2. Using the expressions that you obtained in step 1, express the area of the isosceles triangle in terms of θ and r. (Substitute (l/2) sin θ for sin ( θ / 2 ) cos ( θ / 2 ) in your expression.)

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Chapter 2 Solutions

Calculus Volume 1
Ch. 2.1 - For the following exercises, points P( 1.5, 0) and...Ch. 2.1 - For the following exercises, points P( 1.5, 0) and...Ch. 2.1 - For the following exercises, points P(-1, -1) and...Ch. 2.1 - For the following exercises, points P(-1,-1) and...Ch. 2.1 - For the following exercises, points P(-1, - 1) and...Ch. 2.1 - For the following exercises, the position function...Ch. 2.1 - For the following exercises, the position function...Ch. 2.1 - For the following exercises, consider a stone...Ch. 2.1 - For the following exercises, consider a stone...Ch. 2.1 - For the following exercises, consider a rocket...Ch. 2.1 - For the following exercises, consider a rocket...Ch. 2.1 - For the following exercises, consider an athlete...Ch. 2.1 - For the following exercises, consider an athlete...Ch. 2.1 - For the following exercises, consider the...Ch. 2.1 - For the following exercises, consider the function...Ch. 2.1 - For the following exercises, consider the function...Ch. 2.1 - For the following exercises, consider the...Ch. 2.1 - For the following exercises, consider the function...Ch. 2.1 - For the following exercises, consider the function...Ch. 2.2 - For the following exercises, consider the function...Ch. 2.2 - For the following exercises, consider the function...Ch. 2.2 - For the following exercises, consider the function...Ch. 2.2 - For the following exercises, consider the function...Ch. 2.2 - For the following exercises, consider the function...Ch. 2.2 - For the following exercises, consider the function...Ch. 2.2 - For the following exercises, consider the function...Ch. 2.2 - For the following exercises, consider the function...Ch. 2.2 - [T] In the following exercises, set up a table of...Ch. 2.2 - [T] In the following exercises, set up a table of...Ch. 2.2 - [T] In the following exercises, set up a table of...Ch. 2.2 - [T] In the following exercises, set up a table of...Ch. 2.2 - [T] In the following exercises, set up a table of...Ch. 2.2 - [T] In the following exercises, set up a table of...Ch. 2.2 - 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In the following exercises, assume that...Ch. 2.3 - In the following exercises, assume that...Ch. 2.3 - In the following exercises, assume that...Ch. 2.3 - In the following exercises, assume that...Ch. 2.3 - In the following exercises, assume that...Ch. 2.3 - [T] In the following exercises, use a calculator...Ch. 2.3 - [T] In the following exercises, use a calculator...Ch. 2.3 - [T] In the following exercises, use a calculator...Ch. 2.3 - In the following exercises, use the following...Ch. 2.3 - In the following exercises, use the following...Ch. 2.3 - In the following exercises, use the following...Ch. 2.3 - yIn the following exercises, use the following...Ch. 2.3 - In the following exercises, use the following...Ch. 2.3 - In the following exercises, use the following...Ch. 2.3 - In the following exercises, use the following...Ch. 2.3 - In the following exercises, use the following...Ch. 2.3 - For the following problems, evaluate the limit...Ch. 2.3 - For the following problems, evaluate the limit...Ch. 2.3 - For the following problems, evaluate the limit...Ch. 2.3 - [T] In physics, the magnitude of an electric field...Ch. 2.3 - [T] The density of an object is given by its mass...Ch. 2.4 - For the following exercises, determine the...Ch. 2.4 - For the following exercises, determine the...Ch. 2.4 - For the following exercises, determine the...Ch. 2.4 - For the following exercises, determine the...Ch. 2.4 - For the following exercises, determine the...Ch. 2.4 - For the following exercises, determine the...Ch. 2.4 - For the following exercises, determine the...Ch. 2.4 - For the following exercises, determine the...Ch. 2.4 - For the following exercises, decide if the...Ch. 2.4 - For the following exercises, decide if the...Ch. 2.4 - For the following exercises, decide if the...Ch. 2.4 - For the following exercises, decide if the...Ch. 2.4 - For the following exercises, decide if the...Ch. 2.4 - For the following exercises, decide if the...Ch. 2.4 - In the following exercises, find the value(s) of k...Ch. 2.4 - 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Sketch the graph of f. Is...Ch. 2.4 - Let f(x)=x41x21forx1,1 . a. Sketch the graph of f....Ch. 2.4 - Sketch the graph of the function y=f(x) with...Ch. 2.4 - Sketch the graph of the function y=f(x) with...Ch. 2.4 - In the following exercises, suppose y=f(x) is...Ch. 2.4 - In the following exercises, suppose y=f(x) is...Ch. 2.4 - Determine whether each of the given statements is...Ch. 2.4 - Determine whether each of the given statements is...Ch. 2.4 - Determine whether each of the given statements is...Ch. 2.4 - Determine whether each of the given statements is...Ch. 2.4 - Determine whether each of the given statements is...Ch. 2.4 - Determine whether each of the given statements is...Ch. 2.4 - Determine whether each of the given statements is...Ch. 2.4 - [T] The following problems consider the scalar...Ch. 2.4 - [T] The following problems consider the scalar...Ch. 2.4 - [T] The following problems consider the scalar...Ch. 2.4 - [T] After a certain distance D has passed, the...Ch. 2.4 - As the rocket travels away from Earth’s surface,...Ch. 2.4 - wqProve the following functions are continuous...Ch. 2.4 - Prove the following functions are continuous...Ch. 2.4 - Prove the following functions are continuous...Ch. 2.5 - In the following exercises, write the appropriate ...Ch. 2.5 - In the following exercises, write the appropriate ...Ch. 2.5 - In the following exercises, write the appropriate ...Ch. 2.5 - In the following exercises, write the appropriate ...Ch. 2.5 - The following graph of the function f satisfies...Ch. 2.5 - The following graph of the function f satisfies...Ch. 2.5 - The following graph of the function f satisfies...Ch. 2.5 - The following graph of the function f satisfies...Ch. 2.5 - The following graph of the function f satisfies...Ch. 2.5 - The following graph of the function f satisfies...Ch. 2.5 - [T] In the following exercises, use a graphing...Ch. 2.5 - [T] In the following exercises, use a graphing...Ch. 2.5 - In the following exercises, use the precise...Ch. 2.5 - In the following exercises, use the precise...Ch. 2.5 - In the following exercises, use the precise...Ch. 2.5 - In the following exercises, use the precise...Ch. 2.5 - In the following exercises, use the precise...Ch. 2.5 - In the following exercises, use the precise...Ch. 2.5 - In the following exercises, use the precise...Ch. 2.5 - In the following exercises, use the precise...Ch. 2.5 - In the following exercises, use the precise...Ch. 2.5 - In the following exercises, use the precise...Ch. 2.5 - In the following exercises, use the precise...Ch. 2.5 - An engineer is using a machine to cut a flat...Ch. 2.5 - Use the precise definition of limit to prove that...Ch. 2.5 - Using precise definitions of limits, prove that...Ch. 2.5 - Using precise definitions of limits, prove that...Ch. 2.5 - Using precise definitions of limits, prove that...Ch. 2.5 - Using the function from the previous exercise, use...Ch. 2.5 - limxa(f(x)g(x))=LMCh. 2.5 - limxa[cf(x)]=cL for any real constant c (Hint....Ch. 2.5 - ...Ch. 2 - wTrue or False. In the following exercises,...Ch. 2 - True or False. In the following exercises, justify...Ch. 2 - True or False. In the following exercises, justify...Ch. 2 - True or False. In the following exercises, justify...Ch. 2 - Using the graph, find each limit or explain why...Ch. 2 - In the following exercises, evaluate the limit...Ch. 2 - In the following exercises, evaluate the limit...Ch. 2 - In the following exercises, evaluate the limit...Ch. 2 - In the following exercises, evaluate the limit...Ch. 2 - wIn the following exercises, evaluate the limit...Ch. 2 - In the following exercises, evaluate the limit...Ch. 2 - In the following exercises, evaluate the limit...Ch. 2 - In the following exercises, evaluate the limit...Ch. 2 - In the following exercises, evaluate the limit...Ch. 2 - In the following exercises, evaluate the limit...Ch. 2 - In the following exercises, use the squeeze...Ch. 2 - In the following exercises, use the squeeze...Ch. 2 - In the following exercises, use the squeeze...Ch. 2 - In the following exercises, determine the value of...Ch. 2 - In the following exercises, determine the value of...Ch. 2 - In the following exercises, use the precise...Ch. 2 - In the following exercises, use the precise...Ch. 2 - A ball is thrown into the air and the vertical...Ch. 2 - A particle moving along a line has a displacement...Ch. 2 - From the previous exercises, estimate the...

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