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luas trapesium = jml sisi sejajar x tinggi : 2
= 15+25 x 12 : 2
= 240 cm2
y = 25
s = 13
alas Δsikusiku = 25-15 = 10 = 5
2 2
t = s²-a²
= 13²-5²
= √169-25
= √144 = 12
L = x+y x t
2
= 15+25 x 12
2
= 40 x 6
= 240cm²