volume kerucut yg panjang diameternya 7cm,tinggi 12cm,adalah

Diket : diameter = 7 cm
Tinggi = 12 cm
Dit=....? volume kerucut
Jawab :
1 / 3.π r2.t
1 / 3. 22 / 7. 7. 12
- 22 / 7 : 7 = 1
- 1/3 : 12 = 4
=22*1*1*4 =88 cm

Dik :
d = 7 cm
t = 12 cm
r = 1/2 x d = 1/2 x 7 = 3,5 cm

V = 1/3 x phi. x r^2 x t
= 1/3 x 3,14 x 3,5^2 x 12
= 1/3 x 3,14 x 12,25 x 12
= 1/3 x 38,465 x 12
= 153,86 cm^3