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d=42cm
r=21 cm
r=tinggi trapesium=21 cm
V.arsir=V.trap - V.½lingkaran
V.arsir=½(a+b)t - ½×phi×r²
V.arsir=½(58+42)21 - ½×22/7×21×21
V.arsir=1.050-693
V.arsir=357 cm²
No. 3
V=La×t
V=(½×a×t)T
V=(½×25×20)42
V=250×42
V=10.500 cm³