Question

I need help with question(5) the answer should be 707cm^3

Answer 1

see explanation

Explanation:

the shape given is half a cylinder

the volume of a cylinder = πr²h , then volume of half a cylinder is

V =
`(1)/(2)` πr²h

here r = 5 and h = 18

V = 0.5 × 3.14 × 5² × 18

= 0.5 × 3.14 × 25 × 18

= 706.5

≈ 707 cm³ ( to the nearest whole number )