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Need help with equation
- Thread starter Rainbow
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A cylinder has a surface area of 339 cm (squared). The radius is two times greater than the height. What is the radius of the cylinder?
Can anyone help me with this?
Please tell us the formula for surface area of a cylinder - as a function of its height and radius of he base.
Please share your work with us.
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A cylinder has a surface area of 339 cm (squared). The radius is two times greater than the height. What is the radius of the cylinder?
Can anyone help me with this?
Let's first start with the formula for the surface area of a cylinder. What is it?
A cylinder has a surface area of 339 cm (squared). The radius is two times greater than the height. What is the radius of the cylinder?
Can anyone help me with this?
Rainbow, you must mean a right-circular cylinder. Does the surface area include a top and a bottom.Does the cylinder have a circular top and/or bottom?
Let's first start with the formula for the surface area of a cylinder. What is it?
Surface area is;; 2 pi. r (squared) + 2 pi. rh
The only info. I have is the surface area (339) and that the radius is two times greater than the height.
Surface area is;; 2 pi. r (squared) + 2 pi. rh
The only info. I have is the surface area (339) and that the radius is two times greater than the height.
Great! So you know r = 2h. Substitute 2h in for r and set the surface area = 339 and solve for h. Once you solve for h, multiply by 2 and, boom, you have your radius. Give it a shot.
Hint: Your answer will be an integer.
Last edited:
Rainbow, you must mean a right-circular cylinder. Does the surface area include a top and a bottom.Does the cylinder have a circular top and/or bottom?
Yes it is a right circular cylinder with both a circular top and bottom.