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⇒ p = (1/2)l + l
⇒ p = (3/2)l
maka
L = 69 cm²
⇒ p · l = 69
⇒ (3/2)l · l = 69
⇒ (3/2)l² = 69
⇒ l² = 2/3 · 69
⇒ l² = 46
⇒ l = √46 cm
maka
p = (3/2)l
= (3/2)(√46) cm
Sehingga
d² = p² + l²
= (3/2 · √46)² + √46²
= 414/4 + 46
= 414/4 + 184/4
= 598/4
d = √598/4
d = (1/2)(√598) cm
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