Question

If the area of the circle is numerically equal to twice its circumference then what is the diameter of the circle?

Solution

Area of circle $$\displaystyle = 2 \times$$ Circumference of circle $$\displaystyle \pi r^2 = 2 \times 2 \pi r$$$$\displaystyle r = 4$$Diameter of circle $$\displaystyle = 2r = 8 cm$$MathematicsRS AgarwalStandard X

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