5² = 2a²
a² = ½(25)
a = √(½(25)) cm.
a = √(12.5) cm.
b = 5-a
b = (5-√(½(25))) cm.
b = (5-√(12.5)) cm.
It implies, blue area is;
½(b²)
= ½(5-√(½(25)))²
= ½(5-√(12.5))²
= ½(25-10√(12.5)+12.5)
= ½(37.5-10√(12.5))
= (18.75-5√(12.5)) cm²
= 1.0723304703 cm²
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