Question

Please help with part A, I’re tried the question but I’m not sure if it’s correct

Answer 1

Answer:

tsa of semi-cylinder is 21.21m²

Step-by-step explanation:

tsa of cylinder = 2πr² + 2πrh

radius = diameter ÷2

= 1.5m

tsa = (2×π×1.5²) + (2×π×1.5×3)

= 4.5π + 9π

= 13.5π

≈ 42.412m²(3d.p) (cylinder)

semi = 42.41 ÷ 2

≈ 21.21m² (2d.p)

(Correct me if i am wrong)

Answer 2

V = Ab·h/2

= π·r²·h/2

r = d/2 = 3m/2 = 1,5m

= π·(1,5m)²·3m/2

= π·2,25m²·1,5m

= 3,375π m³

= 10, 5975 m³

π = 3,14