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### Grade 7 - Mathematics9.9 Circumference of a Circle - I

 Example: The diameter of a circle is 21 cm. Find its circumference. Solution: Given that, Diameter (d) = 21 cm. The circumference of the circle = pd. We know the value of p = 22/7 Circumference = 22/7 * 21 = 22 * 3 = 66 cm. Directions: Read the above example carefully and answer the following questions. Draw 10 different circles. Find the circumference of each circle by using the formula and by using a thread.
 Q 1: Find the radius of a circle if its circumference is given by 140p cm.160 cm140 cm70 cm120 cm Q 2: Find the diameter of a circle if its circumference is given by 33 cm.6.3 cm10.5 cm12.5 cm4.3 cm Q 3: Find the radius of a circle if its circumference is given by 219.91 cm.46 cm35 cm40 cm36 cm Q 4: Find the diameter of a circle if its circumference is given by 20p.15 cm20 cm16 cm19 cm Q 5: The radius of a circle is Ö225 cm. Find its circumference.90.28 cm86.30 cm94.25 cm105.25 cm Q 6: The diameter of a circle is 35 cm. Find its circumference.110 cm90 cm120 cm100 cm Question 7: This question is available to subscribers only! Question 8: This question is available to subscribers only!