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K : 4 = s
112 : 4 = s
28 = s
L₁ = s × s
= 28 × 28
= 784 cm²
a² + b² = c²
28² + 28² = c²
784 + 784 = c²
1568 = c²
√784×2 = √c²
28√2 = c
L₂ = 1/4 × π × d × d
= 1/4 × 22/7 × 28√2 × 28√2
= 22 × 4√2 × 7√2
= 22 × 28√4
= 22 × 28 × 2
= 1232 cm²
L = L₂ - L₁
= 1232 cm² - 784 cm²
= 448 cm²