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Grade 8 - Mathematics3.40 Ring - I

 Example: The radius of a circular path of garden is 60 metres. A circular path of width 3.5 metres is laid around and outside the garden. Find its area. Solution: We have given that, r = 60 metres and width of the path = 3.5 metres. So, the radius of the outer ring = 60 + 3.5 = 63.5 metres Hence the area of the path = p (R+r)(R-r) = 22/7 * (63.5 + 60)(3.5) = 22/7 * 123.5 * 3.5 = 1358.5 Sq. mt. Directions: Solve the following problems. Also write at least ten examples of your own.
 Q 1: The radius of a circular path of garden is 30 metres. A circular path of width 2.8 metres is laid around and outside the garden. Find its area.552.64 Sq. mt.5526.4 Sq. mt.55264 Sq. mt.55266 Sq. mt. Q 2: The radius of a circular path of garden is 9 metres. A circular path of width 3.5 metres is laid around and outside the garden. Find its area.236.5 Sq. mt.218.5 Sq. mt.236 Sq. mt.208.5 Sq. mt. Q 3: The radius of a circular path of garden is 65 metres. A circular path of width 0.7 metres is laid around and outside the garden. Find its area.2875.4 Sq. mt.287.54 Sq. mt.28.754 Sq. mt.287.4 Sq. mt. Q 4: The radius of a circular path of garden is 70 metres. A circular path of width 17.5 metres is laid around and outside the garden. Find its area.866.25 Sq. mt.8662 Sq. mt.86625 Sq. mt.8662.5 Sq. mt. Q 5: The radius of a circular path of garden is 80 metres. A circular path of width 4.9 metres is laid around and outside the garden. Find its area.2539.46 Sq. mt.253.946 Sq. mt.25394.6 Sq. mt.253946 Sq. mt. Q 6: The radius of a circular path of garden is 77 metres. A circular path of width 7 metres is laid around and outside the garden. Find its area.3548 Sq. mt.3542 Sq. mt.3544 Sq. mt.3546 Sq. mt. Question 7: This question is available to subscribers only! Question 8: This question is available to subscribers only!