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luas alas (trapesium) = (8 + 16) x 15 x 1/2 = 24 x 15 x 1/2 = 360/2 = 180
keliling = EF + AB + AE + FB =
FB² = AE² + (AB - EF)²
FB² = 15² + (16-8)²
FB² = 15² + 8²
FB² = 225 + 64
FB = √289
FB = 17
keliling = 8 + 16 + 15 + 17 = 56
luas permukaan =
2 x 180 + 56 x 9 =
360 + 504 = 864 cm² (A)