Answer: 250 metre
Step-by-step explanation:
The radius of the semi circle will be:
Radius r = diameter/ 2
Where diameter = 140
r = 140/2 = 70m
The radius is also equal to the width of the diameter.
Find the quarter of the circumference of a circle.
Circumference of a circle = 2πr
Substitute for r in the formula
Circumference = 2 × 22/7 × 70
Circumference = 44 × 10 = 440 m
Divide the circumference by 4
440/4 = 110 m
The perimeter P of the shaded region will be
P = 110 + 70 + 70
Perimeter = 250 m
Therefore, the perimeter of the shaded region is 250 m
