## How do you find surface area using volume?

In order to calculate its surface area or volume, you must know the radius of the base and the length of the side. If you do not know it, you can find the side length (s) using the radius (r) and the cone’s height (h).

### What is the formula for finding surface area?

Since there are 6 identical sides of a cube, to find the surface area, simply multiply the area of one side times 6. The formula for surface area (SA) of a cube is SA = 6a2, where a is the length of one side. The units of surface area will be some unit of length squared: in2, cm2, m2, etc.

**How do you find surface area?**

1) Know the parts of the equation, Surface Area = 4πr2. This nearly ancient formula is still the easiest way to determine the surface area of a sphere. 2) Find the radius of the sphere. Sometimes your problem will supply you the radius, and other times you will have to find it yourself. 3) Square the radius by multiplying it by itself. You can either do this by manually multiplying (5 2 = 5 * 5 = 25) or by using your calculator’s 4) Multiply this result by 4. While you can multiply either 4 or pi first, it is generally easier to start with 4 since there are no decimals to multiply 5) Multiply the results by pi (π). If your problem says “exact value”, write the symbol π after your number and call it done. 6) Remember to add you units to the final answer. Is your sphere’s surface area 314 inches big, or 314 miles big? 7) Practice with an example. If the radius of a sphere is 7 centimeters, what is the surface area of that sphere? 8) Understand surface area. The surface area of a sphere is the area covering the outside of the sphere — think of it as the rubber covering a kickball or

**What unit is used to measure surface area?**

The surface area of a 3-D object is the sum of all the areas of all the 2-D surfaces of the object; so, its unit is the same as that of area. The SI unit of area is square metre ([math]m^2[/math]). Surface area is measured by multiplying two lengths.