Question

The total surface area of solid cylinder is 616 CM square and radius is 7 cm find the height. ​

Answer 1

there is a formula A = 2π r h + 2π r².

=> h = (A - 2π r²) / 2π r

=> h = ( 616 - 2π(7)^2) / 2π(7)

=> h = 7.0