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66= 40 + 2x
2x = 66-40
2x = 62
x = 13 cm
Tinggi trapesium = √13²-5² = 12 cm
*5 itu dari (25-15) :2
Luas = 1/2 (a+b) x t
= 1/2 (25 +15) x 12
= 1/2 (40 x 12)
=1/2 (480)
=240 cm