A = 15 * 21 = 315 m2
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The average of 6, 15 and m is (6 + 15 + m) / 3 = (21 + m)/3 = 7 + m/3
0.5*(15+12)*4 = 54 sq m
Curved surface area = pi*2*15 = 94 square meters (to nearest integer)
The area of the floor: 25 m length and 15 m width is 375 m2.
The base is 21m because area is 0.5*20*21 = 210 square m