The area, A of 2 semi-circles separated by a fixed length can be expressed as a quadratic equation provided the perimeter of the shape, P is known: A = -ar² + Pr (1) Consider an application of this equation where a pool is to be constructed as shown below with the following dimensions: Figure 1: Top view of a pool design. a) Derive an equation for the perimeter of the pool, P in terms of 1 and r. b) Express the area of the pool, A in terms of 1 and r.

Elementary Algebra
17th Edition
ISBN:9780998625713
Author:Lynn Marecek, MaryAnne Anthony-Smith
Publisher:Lynn Marecek, MaryAnne Anthony-Smith
Chapter10: Quadratic Equations
Section10.5: Graphing Quadratic Equations
Problem 10.108TI: A toy rocket shot upward from the ground at a rate of 208 ft/sec has the quadratic equation of...
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The area, A of 2 semi-circles separated by a fixed length can be expressed
as a quadratic equation provided the perimeter of the shape, P is known:
A = -лr² + Pr
(1)
Consider an application of this equation where a pool is to be constructed
as shown below with the following dimensions:
1
1
r
Figure 1: Top view of a pool design.
a) Derive an equation for the perimeter of the pool, P in terms of 1
and r.
b) Express the area of the pool, A in terms of I and r.
Transcribed Image Text:The area, A of 2 semi-circles separated by a fixed length can be expressed as a quadratic equation provided the perimeter of the shape, P is known: A = -лr² + Pr (1) Consider an application of this equation where a pool is to be constructed as shown below with the following dimensions: 1 1 r Figure 1: Top view of a pool design. a) Derive an equation for the perimeter of the pool, P in terms of 1 and r. b) Express the area of the pool, A in terms of I and r.
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Follow-up Question
e) If the pool shape is restricted such that the dimension, 1 is 1.5 m,
what will be the radius, r if the pool is to maintain its perimeter,
P of 8 m?
Transcribed Image Text:e) If the pool shape is restricted such that the dimension, 1 is 1.5 m, what will be the radius, r if the pool is to maintain its perimeter, P of 8 m?
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Follow-up Question
c) Hence, or otherwise show that A = -r² + Pr.
d) Find the radius, r and the dimension, I that maximises the pool
area for a pool perimeter, P of 8 m.
Transcribed Image Text:c) Hence, or otherwise show that A = -r² + Pr. d) Find the radius, r and the dimension, I that maximises the pool area for a pool perimeter, P of 8 m.
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