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L = 1/2 x d1 x d2
= 1/2 x 24 x 26
= 312 cm2
S = Keliling ÷ 4
S = 52 cm ÷ 4
S = 13 cm
D₂ = √13 - √12
D₂ = 169 - 144
D₂ = 25 cm
D₂ = √25 cm
D₂ = 5 cm × 2
D₂ = 10 cm
Luas = D₁ × D₂ ÷ 2
Luas = 24 cm × 10 cm ÷ 2
Luas = 120 cm