Jari jari alas kerucut 20cm. Jika panjang garis pelukisnya 25cm, maka volumenya.....(π=3,14)

t = √(s² - r²)
t = √ (25² - 20²)
t = √( 625 - 400)
t = √225
t = 15 cm

Volume = ⅓ . La . t
= ⅓ . π . r² . t
= ⅓ . 3,14 . 20 . 20 . 15
= 6.280 cm³

r=20 cm
s=25 cm
t=?
t²=s²-r²
=25²-20²
=625-400
=√225
=15 cm=t
V kerucut=1/3×Πr²t
=1/3×3,14×20×20×15
=1/3×18.840
=6.280 cm³