volume suatu kerucut 770 cm³. jika tinggi kerucut 15 cm dan π=22/7, hitunglah panjang jari-jari alas tersebut

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

Diket :
V = 770 cm³
t = 15 cm
π = 22/7

Ditanya :
r = ?

Jawab ;

V krucut = ⅓ πr²t
770 = ⅓. 22/7. r² .15 (15 disderhnkan 3)
770 = ²²/7. 5. r²
770.7 = 22. 5.r²
35. 7 = 1. 5. r²
245 = 5. r²
r² = 245/5 = 49
r = √49
r = 7 cm

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