Question

volume of cylinder is 748 centimetre cube its length is 14 cm and its external radius is 9 cm find its thickness total surface area and surface area​

Answer 1

Answer:

here my question is why did you give volume of cylinder

Answer 2

▣ SoluTion ▣

$\sf {External\ radius (R) = 9 cm}\\\\\sf {Internal\ radius = r cm}$

$\sf {Volume\ of\ pipe = \pi h ( R^2 - r^2 )}$

$748 = \frac{22}{7}\times 14\ (9^2 - r^2)\\\\17 = (9^2 - r^2)\\\\17 = 9^2 - r^2\\\\r^2 = 9^2 - 17\\\\r^2 = 81 - 17\\\\r = \sqrt{64}\\\\r = 8$

$\rule {130}{2} \ Be\ Brainly\ \star$