Question

Α = πr2
Find the value of A when pi = 3.142 and r = 5

Answer 1

Plug in the values
A = 3.142 * 5^2
A = 3.142 * 25 = 78.55
The value of A is 78.55

Answer 2

n(3.142) times r(5) times (2)

= 31.42