Question

In the diagram below shows the cross section of a bridge with a semi circle hole. If the perimeter of the cross section is 24m. Calculate

B. Area of the cross section ( π =22/7)​

Answer 1

the area is 85.239 m²

Explanation:

perimeter of a semi circle = ½πd

24 = ½ x 22/7 × d

24 x 7/11 = d

15.27 m = diameter...

area = ½πr²

= ½ × 22/7 x 7.365 x 7.365

= 85.239 m2