Perimeter of a Triangle

The perimeter of a shape is the length around the shape. In order to find the perimeter of a triangle, add the lengths of the sides: .

Because the lengths are in inches, the answer must be in inches as well.

There are three equal sides in an equilateral triangle.

Substitute the side length.

To begin, first find the length of the third side of the triangle. We are given that the two short sides of the triangle have lengths of 5 and 12. Use the Pythagorean Theorem to find the length of the third side:

,

where and represent the two shorter sides of the triangle, and is the hypotenuse:

Now that we have the lengths of all three sides, add them together to find the perimeter:

The perimeter of the triangle is 30.

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

inches

The equation for the area of a tirangle is

The base in this equation is and the height is which can be plugged into the formula as:

Finally, we multiply to get:

In an isosceles triangle, two of the three sides are equal to each other. The possible side lengths of the isosceles are or .

The perimeter is the sum of the three sides.

The only possible perimeters given the two side lengths are either or .

The correct answer is:

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

square inches

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

inches

To find the perimeter of any object, simply add the length of each side together. This triangle has sides of 4, 4, and 7, so the answer is:

inches

The formula for the perimeter of a triangle is

where a, b, 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.