Let a be the radius of the circle.
b = 2a units.
b is the diameter of the circle.
Observing similar plane shape (right-angled) side length ratios.
6 - 2a
a - 10
Cross Multiply.
2a² = 60
a = √(30) units.
Again, a is the radius of the circle.
Area circle is;
πa²
= π√(30)²
= 30π square units.
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