Question : The area of a square is 1296 cm2 and the radius of a circle is $\frac{7}{6}$ of the length of a side of the square. What is the ratio of the perimeter of the square and the circumference of the circle? [Use $\pi=\frac{22}{7}$ ]
Option 1: 13 : 11
Option 2: 8 : 11
Option 3: 6 : 11
Option 4: 3 : 7
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Correct Answer: 6 : 11
Solution : Area of the square = 1296 cm$^2$ Radius of the circle = $\frac{7}{6}$ of the length of a side of the square Area of the square = Side$^2$ = 1296 Side = $\sqrt{1296}$ = 36 cm Now, Radius of circle = $\frac{7}{6}\times 36$ = 42 cm Perimeter of the square = 4 × Side Perimeter of the square = 4 × 36 = 144 cm Circumference of the circle = $2\pi r$ Circumference of circle = $2\times \frac{22}{7} \times 42 = 44 \times 6$ = 264 cm The ratio of the perimeter of the square and the circumference of the circle = $\frac{144}{264}= \frac{6}{11}$ = 6 : 11 $\therefore$ The ratio of the perimeter of the square and the circumference of the circle is 6 : 11. Hence, the correct answer is 6 : 11.
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Question : The breadth of a rectangle is $\frac{4}{5}$th of the radius of a circle. The radius of the circle is $\frac{1}{5}$ of the side of a square, whose area is 625 cm2. What is the area of the rectangle if the length of the rectangle is 20 cm?
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