Perimeter of a square and circumference of a circle are in the ratio 13:11, respectively. If area of the square is 169 cm2, then find the radius of the circle. (Take π = 22/7)
Let the perimeter of the square and circumference of the circle be ‘13x’ cm and ‘11x’ cm, respectively. Area of square = a2 (Where ‘a’ is the side of the square) ATQ; 169 = a2 Or, a = 13 cm So, perimeter of the square = 13 × 4 = 52 cm So, circumference of circle = 52 × (11x/13x) = 44 cm Circumference of circle = 2πr (Where ‘r’ is the radius) So, 44 = 2 × (22/7) × r Or, r = 7 cm Therefore, radius of the circle is 7 cm.
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