Calculating Area Green.
Let r be the radius of the ascribed quarter circle.
a²+1² = r²
a² = r²-1
a = √(r²-1) cm.
a is the diameter of the white inscribed circle.
b = ½(a)
b = ½√(r²-1) cm.
b is the radius of the white inscribed circle.
Therefore, area green is;
Area ascribed quarter circle - Area inscribed white circle.
¼(r²)π-(½√(r²-1))²π
= ¼(πr²)-¼(πr²)+¼(π)
= ¼(π) cm²
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