adik..you need to know the formula...wait i help you with this first..
after this,please study about the formula.. its important ..then what you need to do is apply them together..
your application skills will be better..so just keep practising.. like people said.. practice makes perfect :)
Thank you☺️

Jawapan

2016-08-06T20:53:52+08:00
(a) volume of hemisphere: 2/3 pie j³
                                   = 2/3 × 22/7 × 21³
                                   = 19404
volume of cylinder= 2 pie jt
                             = 2 × 22/7 × (10.5)² × 10
                             = 6930
volume of the solid= 19404+6930
                              = 26334cm³