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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: Find the perimeter of the semicircle if its diameter is given by 28 cm.1.6 cm2.8 cm72 cm16 cm Q 2: Find the perimeter of a semicircle if its diameter is given by 35 cm.55 cm45 cm90 cm25 cm Q 3: The perimeter of a semicircle is 36 cm. Find its diameter.18 cm15 cm16 cm14 cm Q 4: The perimeter of a semicircle is 54.5 cm. Find its diameter.21.2 cm22.2 cm22 cm23 cm Q 5: The perimeter of a semicircle is 22x units. Find its diameter.13.52x units13.02x units14.01x units14.52x units Q 6: The perimeter of a semicircle is (14 x16)/10 cm. Find its diameter.8.71 cm6.71 cm9.71 cm2.71 cm Question 7: This question is available to subscribers only! Question 8: This question is available to subscribers only!

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