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The area of a circle is 1386 cm2. What is the radius of the circle? [Use $π =\frac{22}{7}$] |
7 cm 14 cm 18 cm 21 cm |
21 cm |
We know that, Area of a circle = πr2 We have, Area of the circle = 1386 cm2 = πr2 = 1386 cm2 = r2 = \(\frac{1386}{ π}\) = r2 = \(\frac{1386 × 7}{ 22}\) = r2 = 441 = r = 21 cm |
