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### Grade 7 - Mathematics9.22 The Area of a Sector - II

 Example: The length of an arc of a sector whose radius is 8 cm, is 10 cm. Find its area. Solution: Given that, l = 10 cm, and r = 8 cm. Formula A = lr/2 Therefore, A = (10 * 8) / 2 A = 80 / 2 A = 40 sq cm. Directions: Read the above example carefully and answer the following questions. Also make 10 examples of your own.
 Q 1: A sector has radius is 15 cm. Find the length of an arc of the sector if its area is given by 1125 sq cm.121 cm150 cm112 cm125 cm Q 2: The length of an arc of a sector whose radius is 7 cm, is 16.8 cm. Find its area.38.2 sq cm48.8 sq cm98.6 sq cm58.8 sq cm Q 3: A sector has radius is 8 cm. Find the length of an arc of the sector if its area is given by 480 sq cm.120 cm120 cm160 cm180 cm Q 4: The length of an arc of a sector is 20 cm. Find the radius if the area of the sector is given by 120 sq cm.14 cm16 cm13 cm12 cm Question 5: This question is available to subscribers only! Question 6: This question is available to subscribers only!

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