Jawapan

2016-09-09T13:47:21+08:00
(a) Volume of a sphere = 4/3πr³
10 = 4/3 × 3.142 × r²

r³ = 10 × 3 / 4 × 3.142
r = ³√10×3 / 4×3.142
= 1.336 m

(b) Volume of a hemisphere = 2/3πr³
20 = 2/3 × 3.142 × r³
r³ = 20×3 / 2×3.142
r = ³√20×3 / 2×3.142
= 2.121cm