Question

Find the height of the figure below if the surface area is 651.13 mm2

Answer 1

The surface area of a cylinder is found by the following:

Circumference of Base times the height plus 2 times the area of the base.

SA = 2*pi*r*h + 2* pi*r^2

651.13 = 2 * pi *4.3* h + 2*pi* (4.3)^2

diameter = 2 times radius
so radius = 8.6/2 = 4.3

@dopegyal_

651.13 = 2 * pi *4.3* h + 2*pi* (4.3)^2

h = ?

Answer 2

I got 19.8 for h . correct?

Answer 3

19.8001approx but rounded to the nearest tenth because the diameter was given in tenths. @dopegyal_