Question

Tolong jawab soal no 2 pliss

Answer 1

90°/360° = 2πr/2πs
=> 1/4 = r/s
=> r = 1/4 s = 1/4 . 20 = 5

t = √(s^2 - r^2) = √(20^2 - 5^2) = √(400 - 25) = √375 = 5√15
V = 1/3 π r^2 t
= 1/3 . (3,14) . 25 . 5√15
= 1/3 . 392,5 √15
= 1/3 . 785/2 √15
= 785/6 √15