Question

The height of a cylinder is three times the diameter of the base. The surface area of the cylinder is 126 ft2. What is the radius of the base?

Answer 1

*126pi^2

Answer 2

- the surface area will be lateral area + 2 time area of base (down and up)
- diameter equal 2 time radius
- the height is 3 time the diameter so what sign that will be 3 time 2r equal 6r
- because area of a circle equal pir^2
- and lateral area of a cylinder equal 2pir time the height of cylinder
- so after this can you continue please ?