Area via Diameter

Note: Area of a circle = πr², where r is the radius of the circle.

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Example: What is the area of a circle whose diameter is 10 cm?
Given: Diameter(d) = 10cm; So, Radius(r) = Diameter/2 = 10/2 = 5cm
Area of a circle: πr² = π x 5² = π x 25 = 25π sq cm