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L = 480
K = 2( alas + sisi miring)
K = 2(20 + 26)
K = 92
panjang AB = 20 + 10 = 30 cm
luas = alas x tinggi = 30 x 24 = 720 cm²
keliling = 2(30 + 26) = 2(56) = 112 cm