t∆² = s² - (a/2)²
= 13² - (10/2)²
= ( 13×13 ) - ( 5×5 )
= 169 - 25
tΔ = 12 cm
Mencari luas permukaan
LP = (2 × L Δ) + (K Δ × tp)
= (2 × 1/2 × 10 × 12) + (10 + 13 + 13) × 20
= (10 × 12) + (36 × 20)
= 120 + 720
= 840 cm²
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Penyelesaian ☁️
t∆² = s² - (a/2)²
= 13² - (10/2)²
= ( 13×13 ) - ( 5×5 )
= 169 - 25
tΔ = 12 cm
setelah itu ⬇️
Mencari luas permukaan
LP = (2 × L Δ) + (K Δ × tp)
= (2 × 1/2 × 10 × 12) + (10 + 13 + 13) × 20
= (10 × 12) + (36 × 20)
= 120 + 720
= 840 cm²
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