Geometry

Geometry Ch 3.1 #36

by | Sep 3, 2013

Questions: Help with Geometry ch.3.1 #36. We don’t understand how to get the last step in the answer. How does the 4 get under the “pie” and not also under the d square? Thanks

 

 

Answer from Dr. Callahan: 

Take these steps

 
A = pi*r^2
 
and 
 
r= d/2
 
 
Now substitute r from the second equation into the first to get
 
 
A = pi (d/2)^2 — so you are squaring both the d and the 2. 
 
 
to get
 
A = pi * d^2 / 4
 

Written By DaleCallahan

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