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### Grade 7 - Mathematics9.5 Diameter of a Circle - II

 Example: The area of a circle is 9.625 sq cm. Find its diameter. Solution: Given that, The area of a circle (A) = 9.625 sq cm. If the radius of the circle is r cm. A = pr2. 9.625 = 22/7 * r2 r2 = (9.625 * 7) / 22 r2 = 3.0625 Take square roots on both sides. r = 1.75 Therefore, the radius of the circle is 1.75 cm. So, the diameter = 2r = 2 * 1.75 = 3.5 cm. Directions: Read the above example carefully and answer the following questions. Also write at least 10 examples of your own.
 Q 1: The area of a circle is 8662.5 sq cm. Find its diameter.105.02 cm55.5 cm210.12 cm10.5 cm Q 2: Find the area of a circle its diameter is given by 35 cm.915.5 sq cm962.1 sq cm945.5 sq cm925.5 sq cm Q 3: The area of a circle is Ö361 sq cm. Find its diameter.6.23 cm4.92 cm3.25 cm5.55 cm Q 4: The area of a circle is 6.16 sq cm. Find its radius.28 cm1.4 cm14 cm2.8 cm Q 5: The area of a circle is 498.96 sq cm. Find its radius.16.51 cm32.5 1cm12.61 cm25.21 cm Q 6: Find the area of the circle if its radius is given by 0.35 cm.1.54 sq cm1 sq cm1.4 sq cm0.385 sq cm Question 7: This question is available to subscribers only! Question 8: This question is available to subscribers only!