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252 = (a + 15) x 14/2
252 = (a+15) x 7
252 = 7a + 105
252 - 105 = 7a
147 = 7a
a = 21 cm
semoga membantu :)
atas = 15
bawah = ?
luas = 252
luas trapesium = (atas + bawah) /2 x 14
252 = (15 + b) /2 x 14
252 x 2 / 14 =15 +b
36 -15 = b
21 = b
bawah = 21 cm