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c² = 6² + 8²
c = 10 ( pitagoras)
L sisi tegak = L alas + 4 L sisi segitiga
= 12*12 + 0,5 *4 ( 10*12)
= 144 + 2 (120)
= 384
x² = 6²+8²
x² = 36+64
x² = 100
x = √100
x = 10 cm
luas sisi tegak karena jumlah sisi tegak berjumlah 4 maka
L = 4(12.10/2)
= 240 cm²