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= 841 - 441
= 400
t = √400 = 20 cm
volume gabungan = πr²t + 1/3πr²t = 4/3 πr²t
= 4/3 × 22/7× 21² × 20 cm³
= 36960 cm³
V tabung = π r² t = 22/7 x 21² x 20 = 27720 dm³
V kerucut = 1/3 π r² t = 1/3 x 22/7 x 21² x 20 = 1/3 x 27720 = 9240 dm³
V gabungan = 27720 + 9240 = 36960 dm³