Question

A certain coin is a circle with diameter 42 mm. What is the exact area of each side of the coin?
The exact area of each side of the coin is mm.
(Simplify your answer. Type an exact answer in terms of .)

Answer 1

The area of a circle is r^2 x PI

r is half the diameter = 21mm

Area = 21^2 x PI

area = 441pi

Answer 2

Answer:

A≈1.39×10-3m²

Step-by-step explanation: