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v 1/2 bola= 1/2 x 4/3πr pangkat 3
v 1/2 bola= 2/3 x 3,14 x 7,5 pangkat 3
v 1/2 bola= 883,125
v kerucut= 1/3 πr kuadrat t
v kerucut= 1/3 x 3,14 x 7,5x7,5x20
v kerucut= 1.177,5
v mainan=v kerucut+v 1/2 bola
v mainan= 1.177,5+883,125
v mainan= 2.060,625