Diketahui trapesium ABCD dengan AB// CD perbandingan panjang AB :CD =5: 3 Jika tinggi trapesium 9 cm dan luasnya 144 cm kuadrat maka panjang AB
samoeljoe
L = (a + b) * t/2 144 = (5x + 3x)*9/2 288 = 8x*9 288 = 72x x = 4 5 . 4 = 20
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GalladeavieroCD/AB = 3/5 ---> CD = 3/5 AB L ABCD = 1/2 ( AB + CD ) x t 144 = 1/2 ( AB + 3/5 AB ) x 9 ( AB + 3/5 AB ) x 9 = 288 8/5 AB = 32 AB = 5/8 x 32 = 20 cm
144 = (5x + 3x)*9/2
288 = 8x*9
288 = 72x
x = 4
5 . 4 = 20
L ABCD = 1/2 ( AB + CD ) x t
144 = 1/2 ( AB + 3/5 AB ) x 9
( AB + 3/5 AB ) x 9 = 288
8/5 AB = 32
AB = 5/8 x 32 = 20 cm