Question

Suatu kerucut panjang garis pelukisnya 29 cm . jika panjang diameter lingkaran alasnya 42 cm dan phi 22/7 maka volumenya adalah......
a. 9,150
b. 9, 240
c. 9, 320
d. 9, 360

Answer 1

T²=s²-r²=29²-21²=400

V=⅓πr²t=⅓.22/7.400.21=8800 cm³

Answer 2

S = 29cm
d = 42cm, r = 21cm
t = √s²-r²
t = √29²-21²
t = √400
t = 20

v = 1/3 . la . t
v = 1/3 × 22/7 . 21² × 20
v = 1/3 . 1386 . 20
v = 9240cm³