Question

Ratio between the radius of the base is is 7 is to 9 if its volume is 1386 cm square find the total surface area of the cylinder

Answer 1

Answer:

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Step-by-step explanation:

Let the Radius and base of the cylinder be 2x and 3x cm respectively. Take the cube root of both the sides. X = 7/2 = 3.5 So Radius = 2*3.5 = 7 cm and Height = 3.5*3 = 10.5 cm. Total Surface area of cylinder = 2πr(r+h) = 2*22/7*7(7+10.5) = 2*22*17.5 = 770 cm square.