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
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.
A = pi * d^2 / 4