Question

4. The function A(r) = πr² gives the area of a circle with radius r. What is the context domain?

I only need help with #4 pls

Answer 1

Domain = [0 , +∞)

Explanation:

since r is the radius of a circle

Then

r must be a positive number.

Then

r ≥ 0

NOTE : if r = 0 ,then the circle reduces to a point .