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kll.alas= 2πr
251, 2= 2. 3,14.r
251,2= 6,28.r
r= 251,2/ 6,28
r= 40
langkah kedua mencari tinggi kerucut
s= √ t.kuadrat + r. kuadrat
50=√ t. kuadrat + 40. kuadrat
50 kudrat= t . kudrat+ 1600
2500 = t kuadrat+ 1600
t= √ 2500- 1600
t= √ 900
t= 30
langkah terakhir mencri volum kerucut
v = 1 per 3 . 3,14 . 40 . 40 . 30
v= 50240
semoga bermafaat :)