Question

Find the area of this semi-circle with diameter,

d
= 73cm.
Give your answer rounded to 2 DP

Answer 1

Answer is A = 2091.63 cm

Step by step

We know the formula for area of a circle
A = pi x radius ^2

We want a semi circle which is half a circle, so 1/2 of Area

Semi circle Area = 1/2 x pi x radius ^2

We know diameter is 73, so half of diameter is the radius = 36.5

A = 1/2 x 3.14 x 36.5^2

A = 1/2 x 3.14 x 1332.25

A = 2091.6325 cm

Round to 2 decimal points

A = 2091.63 cm