Credit:Sam EdwardsCaiaimageGetty Images
Q:

# How do you find the base of a triangle?

A:

Find the base of a triangle by solving the equation: area = 1/2 x b x h. You need to know the area and height to solve this equation.

Know More

1. Substitute numbers for area and height

Put the area before the equals sign, and replace the letter h with the height. For example, if the area is 15 centimeters, and the height is 10 centimeters, the equation would look like this: 15 = 1/2 x b x 10.

2. Multiply 1/2 by the height

Calculate 1/2 x h/1 to get h/2. For example, 1/2 x 10/1 equals 10/2, which equals 5. Now the equation looks like this: 15 = 5b.

3. Isolate the b variable

To isolate b, divide the entire equation by the number on the same side of the equation as b. For example, 15 = 5b becomes 15/5 = 5b/5. Five divided by 5 equals 1, so b is now alone on one side of the equation, which now reads 15/5 = b.

4. Solve for b

Divide the numbers on the other side of the equation to solve for b. For example, 15 divided by 5 is 3, so 3 = b. The base of the triangle measures 3 centimeters.

## Related Questions

• A:

The volume of a cone is found by multiplying the area of the circular base by the height of the cone, and then dividing the product by 3. The area of the base is found by taking the square of the radius and multiplying it by pi.

Filed Under:
• A:

The surface area of a cylinder is derived by adding up the area of the top, the area of the base and the area of the side. The base and the top are equal, so the area of one can be calculated then multiplied by 2.

Filed Under:
• A:

Calculate the surface area of a cone by first finding the area of the slanted section on top and the area of the base. Add these two areas together to get the total surface area of the cone.