   Chapter 9.2, Problem 24E Elementary Geometry For College St...

7th Edition
Alexander + 2 others
ISBN: 9781337614085

Solutions

Chapter
Section Elementary Geometry For College St...

7th Edition
Alexander + 2 others
ISBN: 9781337614085
Textbook Problem

For the regular square pyramid shown, suppose that the sides of the square base measure 10   m each and that the lateral edges measures 13   m each.a) Find the lateral area L of the pyramid.b) Find the total area A of the pyramid.c) Find the volume V of the pyramid. To determine

(a)

To find:

The lateral area of the pyramid.

Explanation

Given:

A regular square pyramid shown, suppose that the sides of the square base measure 10m each and that the lateral edges measures 13m each.

Properties used:

A pyramid is made by connecting a base to an apex. The base is flat with straight edges, no curves, hence, a polygon and all other faces are triangles.

A regular pyramid is a pyramid whose base is a regular polygon and whose lateral edges are all congruent.

The lateral area L of a regular pyramid with slant height of length l and perimeter P of the base is given by

L=12lP.

According to the Pythagorean theorem, in a right-angled triangle

hypotenuse2=base2+perpendicular2.

The perimeter of the square is four times the side.

Calculation:

From the given figure,

The sides of the square base measure 10m each and that the lateral edges measures 13m each i.e. e=13m

To determine

(b)

To find:

The total area of the pyramid.

To determine

(c)

To find:

The volume of the pyramid.

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