Email us to get an instant 20% discount on highly effective K-12 Math & English kwizNET Programs!

#### Online Quiz (WorksheetABCD)

Questions Per Quiz = 2 4 6 8 10

### 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 115.69 cm. Find its radius.39.5 cm19.5 cm29.5 cm22.5 cm Q 2: The perimeter of a semicircle is (14 x16)/10 cm. Find its diameter.9.71 cm2.71 cm6.71 cm8.71 cm Q 3: The perimeter of a semicircle is 54.5 cm. Find its diameter.22.2 cm21.2 cm23 cm22 cm Q 4: The perimeter of a semicircle is 36 cm. Find its diameter.18 cm16 cm14 cm15 cm Q 5: Find the perimeter of a semicircle if its diameter is given by 35 cm.55 cm25 cm90 cm45 cm Q 6: The perimeter of a semicircle is 22x units. Find its diameter.14.01x units13.52x units13.02x units14.52x units Question 7: This question is available to subscribers only! Question 8: This question is available to subscribers only!