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Find the radius using surface area and height?
FIrst we need to know what the object is? Perhaps you mean a cone or a cylinder?
What is a real-world situation in which you would find the surface area of a cylinder?
You would need to know the surface area of a cylinder if you are a factory worker at Pepsi. You would need to know the dimensions of the label, so it will fit on the can.
How do you find the surface area of a 3d object?
It depends, but in let's look at a simple example to help you see how. How would you find the surface area of a cube. Find the surface area of one of the faces and since there are six of those, multiply it by 6. For example, a 2x2x2 cube. Each face has a surface area of 4 and there are 6 of them so the total surface area is 24 units. We do the same thing with other 3d objects, but it may be harder to find the surface area of faces. In face, sometimes there are no faces and we may need calculus to find the surface area.
When would you need to know the volume of a cube?
When asked to work out the lengths of its edges and its surface area.
How do you find the the radius of a cylinder if you know the surface area?
You cannot. You need to know the height as well. If you know the height, the surface area, A is given by A = 2*Ï€*r2 + 2*Ï€*r*h where r is the radius and h the height.
