Question

I need help with a MathsWatch question!

Answer 1

To find the area of a circle, you do π × diameter (in this case 10). They have told you to use 3.142 as π, so you do 3.142 × 10 = 31.42. Because it's a semi-circle, you need to halve 31.42 to get 16.21, which is the answer

Answer 2

A = $\pi$ x r²
A = 3.142 x 5²
A = 9818.75

Semicircle
9818.75 / 2 = 4909.38