Question

the ratio between the radius of the base and the height of a cylinder is 7:9 if its volume is 1386cm³ find the total surface area of the cylinder​

Answer 1

let radius =7x and height=9x

22/7×7x×7x×9x=1386

or,441x³=1386×7/22

or,441 x³=441

or,x³= 1

or,x=1

radius=7cm

height=9 cm