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= (1/2.12)² + 8²
= 6² + 8²
= 36 + 64
tst = √100 = 10 cm
LΔ = 1/2 × r × tst
= 1/2 × 12 × 10
= 60 cm²
Lp sisi tegak = 60 cm² × 4
= 240 cm²