Tentukan volume kerucut yg diketahui diameter alasnya 30 cm dan garis pelukisnya 25 cm ? (22/7)

V = ⅓ × πr²t
diameter = 30 cm
r = 15 cm
t = √(25²-15²)
= √(625-225)
= √400
= 20 cm
V = ⅓ × 22/7 × 15 × 15 × 20
= 4714,3 cm³

r = d/2
= 30/2
= 15
t" = s" - r"
= 25" - 15"
= 625 - 225
t" =Akar 400
t = 20 cm
V = 1/3 phi.r".t
= 1/3. 3,14. 15. 15. 20
= 3,14. 5. 15. 20
= 15,7. 15. 20
= 4710 cm per kubik