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Panjang Alas = ( Luas ÷ ÷ Tinggi ) - Panjang Atap
= ( 260 ÷ tex] \frac{1}{2} [/tex] ÷ 13 ) - 17
= ( 260 × tex] \frac{2}{1} [/tex] ÷ 13 ) - 17
= ( 520 ÷ 13 ) - 17
= 40 - 17
= 23 Cm
260 = (a+17) x 13/2
260 x 2 = (a + 17) x 13
520 = 13a + 221
520-221 = 13a
299 = 13 a
a = 299/13
a= 23