Answer:
107.25 metres.
Step-by-step explanation:
diameter of circle = 150m,
so,
radius = 75 m
perimeter of semi circle
= pi × r
= 3.14 × 75
= 235.5 m
perimeter of rectangle
= 2 × (l+b)
= 2 × (150 + 75)
= 450 m
perimeter of shaded region
= perimeter of rectangle - perimeter of semi circle/2
= 450 - 235.5/2
=107.25 metres
