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Verified answer
D = 42 cmr = 42/2 = 21 cm
s = 29 cm
t = √29²-21² = √841-441 = √400 = 20 cm
π = 22/7
V = πr²t/3 = 22/7 x 21 x 21 x 20/3 = 11 x 840 = 9.240 cm³
B