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s= 17
cari diagonal alin dengan rumus phytagoras
17² = x² + 8²
289 = x² + 64
225 = x²
15 = x
d2 = 15.2 = 30
L = d1.d2 / 2= 16 . 30 / 2 = 240cm²
semoga membantu^^
= 17 × 16 1/2
=136