# Pre-Algebra : Perimeter of a Triangle

## Example Questions

### Example Question #11 : Perimeter Of A Triangle

What is the perimeter of an equilateral triangle with a side of ?

Explanation:

Write the formula to find the perimeter of an equilateral triangle.  All three sides are equal.

Substitute the side length.

### Example Question #12 : Perimeter Of A Triangle

If the area of an equilateral triangle is 10, and the height is 10, what must be the perimeter of the triangle?

Explanation:

Write area formula for a triangle.

Substitute the area and the height to find the length of the base.

The base, or the length one side of the triangle, is two.

An equilateral triangle has three equal sides.  Multiply the base by three to find the perimeter.

### Example Question #331 : Geometry

What is the perimeter of an isosceles triangle with a base length of ?

Explanation:

For an isosceles triangle, two of the side legs are equal. It is necessary to know two of the three sides in order to sum the lengths. The problem only gave us the length of the base.

There is not enough information to solve this question since the length of the other leg is unknown.

### Example Question #12 : Perimeter Of A Triangle

Find the perimeter of an isosceles triangle with a base of 4 inches and side length of 10 inches.

Explanation:

An isosceles triangle has two sides that have the same length. If the base is 4 and one of the sides is 10, then the other side is also 10.

### Example Question #11 : Perimeter Of A Triangle

An isosceles triangle measures  inches along its two equal sides, and  inches along its third side.  What is the area of the triangle?

square inches

square inches

square inches

square inches

square inches

square inches

Explanation:

To find the perimeter of any object, simply add the length of each side together.  The best answer is:

square inches

### Example Question #11 : Perimeter Of A Triangle

An equilateral triangle measures  inches along its side.  What is the area of the triangle?

square inches

square inches

square inches

square inches

square inches

square inches

Explanation:

To find the perimeter of any object, simply add the length of each side together.  The best answer is:

square inches

### Example Question #341 : Geometry

Find the perimeter of an equilateral triangle with a side of length 14 inches.

Explanation:

The formula for the perimeter of a triangle is

where ab, and c are the lengths of each side.

We know that an equillateral triangle has 3 equal sides. Therefore,

Therefore, the perimeter of an equillateral triangle with a side of length 14 inches is 42 inches.

### Example Question #12 : Perimeter Of A Triangle

A man is planting a flower bed in the shape of a triangle.  It measures three feet along one edge, four feet along another, and five feet along its final edge.  What is the perimeter of the triangle?

square feet

square feet

square feet

square feet

square feet

square feet

Explanation:

To find the perimeter of any object, simply add the length of each side together.  The best answer is:

square feet

### Example Question #13 : Perimeter Of A Triangle

An isosceles triangle measures eight inches along its two equal sides, and ten inches along its third side.  What is the area of the triangle?

square inches

square inches

square inches

square inches

square inches

square inches

Explanation:

To find the perimeter of any object, simply add the length of each side together.  The best answer is:

square inches

### Example Question #11 : Perimeter Of A Triangle

An isosceles triangle measures  inches along its two equal sides, and  inches along its third side.  What is the area of the triangle?

inches

inches

inches

inches

inches