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### Grade 7 - Mathematics9.7 Diameter of a Circle - I

 Example: The perimeter of a semicircle is 30 cm. Find its diameter. Solution: Let the radius of the circle be r cm. Given that, The perimeter of the semicircle (2+p)r = 30cm. Þ (2 + 22/7) * r = 30 Þ 36/7 * r = 30. \ (30*7)/36 Þ 5.8333.......cm. Þ 5.8 cm. (approximately) \ Diameter of the semicircle = 2r = 2 * 5.8 = 11.6 cm. Directions: Read the above example carefully and answer the following questions. Draw 6 different semicircles. Find the radius and perimeter of each of them.
 Q 1: The perimeter of a semicircle is 36 cm. Find its diameter.16 cm18 cm15 cm14 cm Q 2: Find the perimeter of the semicircle if its diameter is given by 28 cm.72 cm16 cm1.6 cm2.8 cm Q 3: The perimeter of a semicircle is (14 x16)/10 cm. Find its diameter.9.71 cm2.71 cm6.71 cm8.71 cm Q 4: Find the perimeter of a semicircle if its diameter is given by 35 cm.45 cm90 cm25 cm55 cm Q 5: The perimeter of a semicircle is 22x units. Find its diameter.14.01x units13.52x units13.02x units14.52x units Q 6: The perimeter of a semicircle is 115.69 cm. Find its radius.39.5 cm29.5 cm19.5 cm22.5 cm Question 7: This question is available to subscribers only! Question 8: This question is available to subscribers only!

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