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maka tinggi sisi tegak
t² = (1/2 · s)² + T²
⇒ t² = (1/2 · 10)² + 12²
⇒ t² = 5² + 12²
⇒ t² = 25 + 144
⇒ t² = 169
⇒ t = 13 cm
maka
L = s² + 4 · (1/2)(s)(t)
= s² + 2st
= 10² + 2(10)(13)
= 100 + 260
= 360 cm²
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