Let the radius and height of the given cylinder be r and h respectively Circumference of base=110cm⇒2πr=110 (1)⇒2×227×r=110⇒r=110×744⇒r=17 5cmC S A of cylinder=4400cm2⇒2πrh=4400⇒110h=4400 [using 1]⇒h=4400110⇒h=40cmVolume of cylinder=πr2h=227×17 52×40=38500cm3

Question no. 5

Question no. 5 7 Weight of ttg• yore EXERCISE 13B 1, Find tie volume ard curved surface area of right circular hoght 21 cm am} base radius 5 cm. 2 diameter of a cylinder is 28 cm and its height is 40 cm. Find curvei surface area, total surface area and the oi cvi.ir•der 3, End weight of a solid cylinder of radius 10.5 cm and heght cm the mate-nal ci the cylinder weighs 3 g per cm 3. 4. Jhe curved surface area oi a cylinder ES 1210 crn: and Its 20 cm. had 'ts height volume curved surface area of a cynnder cm and the circumtereqv• of Its is cm- Find the and the volume oi the hnde•r

Let the radius and height of the given cylinder be r and h respectively . Circumference of base = 110 cm \Rightarrow 2 πr = 110 . . . (1) \Rightarrow 2 \times \frac{22}{7} \times r = 110 \Rightarrow r = 110 \times \frac{7}{44} \Rightarrow r = 17.5 cm C . S . A of cylinder = 4400 {cm}^{2} \Rightarrow 2 πrh = 4400 \Rightarrow 110 h = 4400 [using 1] \Rightarrow h = \frac{4400}{110} \Rightarrow h = 40 cm Volume of cylinder = {πr}^{2} h = \frac{22}{7} \times 17 . 5^{2} \times 40 = 38500 {cm}^{3}

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