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1/2 × 60 × d₂ = 960
d₂ = 960 : 60 × 2
d₂ = 16 × 2
d₂ = 32
a = d₁ : 2
= 60 cm : 2
= 30 cm
b = d₂ : 2
= 32 : 2
= 16 cm
a² + b² = c²
30² + 16² = c²
900 + 256 = c²
1156 = c²
√1156 = √c²
34 = c
s = c
= 34 cm
K = 4 × s
= 4 × 34 cm
= 136 cm