The area of a circle in terms of the circle's radius

is

Differentiating both sides with respect to

, you get
Answer:
im sorry cant help
Step-by-step explanation:
Answer:
a = √10
Step-by-step explanation:
a² + b² = c²
a² + 9² = (√91)²
a² + 81 = 91
a² = 10
a = √10
hope this helps :)
8 would be the length of each piece of wire I think.
Answer:=16
Step-by-step explanation:
hope this helps:)