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276 = (14+32) t :2
t = 276 : 23
t = 12 cm
b. a²= 12²+ 9²
a²= 144 + 81
a²=225
a =15
14 + 32 + 15 +15 = 76 cm
jadi tinggi trapesium 12 cm dan keliling trapesium 76 cm