Question
Point (4, 5) is the centre of a circle. A point (9, 11)
is lying on a circle. Find the area of the circle.Solution
In the figure (4,5) is the centre of the circle. ∴ Radius (r) = √((4-9)^2+(5-11)²)   = √(25+36) = √61 ∴ Area of the circle = πr² = π(√61)² = 61π unit²
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DFRL located at
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