Question

Volume suatu kerucut 770 cm³.Jika tinggi kerucut 15 cm dan π=22/7,Hitunglah panjang jari2 alas kerucut tersebut

Answer 1

V=1/3πr²t
770 cm³=1/3×22/7 ×r²× 15 cm
770 cm³=15,71 r²
r² =770/15,71
r²= 49,013
r= 7,00095

Answer 2

V=1/3×π×r²×t
770=1/3×22/7×r²×15
770×7=110r²
5390=110r²
r²=5390/110
r²49
r=√49
r=7
 jadi jari jari alas 7 cm