Let the radius of the inscribed circle be r.
Therefore the radius of the ascribed circle, R will be;
R = √(4²+r²)
R = √(16+r²) units.
Therefore;
Area yellow is;
Area circle with radius √(16+r²) units - Area circle with radius r units.
= π(√(16+r²))² - πr²
= π(16+r²) - πr²
= 16π + πr² - πr²
= 16π square units.
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