In this case, we'll have to carry out several steps to find the solution.
Step 01:
data
diameter = 4 m
lenght = 7.5 m
semi-circle area = ?
rectangle area = ?
Step 02:
circle area = π r ²
r = diameter / 2 = 4 m = 2 m
semi-circle area = (3.14 * ( 2 m) ² ) / 2
= 12.56 m² / 2
= 6.28 m²
rectangle area = l * w
w = diameter = 4 m
rectangle = 7.5 m * 4 m = 30 m ²
The answer is:
the semi-circle area is 6.28 m²
the rectangle area is 30m²