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t^2 = (rv5)^2 + r^2 ==========> t= r*v6 cm
volume bandul = volume kerucut + volume setengah bola
= 1/3 * phi * r^2 * t + 1/2 * 4/3 * phi * r ^3
= v6/3 * phi * r^3 + 2/3 * phi * r^3
= phi * r^3 ( v6/3 + 2/3)
= ((2+v6)/3) * phi * r^3 cm3