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Textbook Page No. 198, , Question 1., What are the radius of the base and, Slant height of a cone made by rolling, up a sector of central angle 60° cut, out from a circle of radius 10, centimetres?, Answer:, R = Radius of the circle, , ru —xR, , 360, , 6 . 105, a SE, 30. 6 3, , Radius of cone = 1.66 cm, , Radius of circular part = slant height, of cone = 10 cm., , IM
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Question 2., , What is the central angle of the sector, to be used to make a cone of base, radius 10 centimetres and slant, height 25 centimetres?, , Answer:, , Central anglejof the sector, , (x) = 7 x 360,, , r=10cm,!1=25cm, , = = x 360, , = 144°
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Question 3., , What is the ratio of the base-radius, and slant height of a cone made by, rolling up a semicircle?, , Answer:, , Radius of bigger circle = R, , Radius of smaller circle = r, , Radius of circular base of the pyramid, R, , 2, Ratio between radius and slant height, |, , shan pw aati?, eee 3