How to find the perimeter of a triangle - SSAT Elementary Level Quantitative (Math)

When finding the perimeter of any triangle, you will need to add all three sides. In this case, it is important to note that this is the perimeter of an equilateral triangle. An equilateral triangle has three equal sides. All the choices add up to 18cm, but only one choice shows three equal sides.

An isosceles triangle has two equal sides, and one different side. All of the answer choices add up to 22 mm, but only one choice shows two equal sides and one different side that add up to 22mm.

In an equilateral triangle, all sides are of equal length. The perimeter of a triangle is the sum of the lengths of the three sides. Our equilateral has a side of length 10, so all sides will be equal to 10. We can find the perimeter by adding up 10 three times.

When finding the perimeter of any triangle, you will need to add all three sides. In this case, it is important to note that this is the perimeter of a scalene triangle. A scalene triangle has no congruent/equal sides. The only choice that adds up to 21 mm with no equal sides is:

To find the perimeter of a triangle, add all of its three sides. 5 + 4 + 3 = 12

Since the problem asks about an equilateral triangle (one that has three equal sides), we just need to multiply the given side's length by 3.

To find the perimeter of a triangle, simply add all three sides together.

When finding the perimeter of any triangle, you will need to add all three sides. In this case, it is important to note that this is the perimeter of an equilateral triangle. An equilateral triangle has congruent/equal sides. All the choices add up to mm (except the choice that shows multiplication instead of addition), but only one choice shows equal sides that add up to mm:

To find the perimeter of a triangle, simply add all three sides together.

A triangle has sides, and its perimeter is the length of all the sides added together. Since all the sides are the same length, dividing the perimeter by will give the length of one side. divided by is inches.

Because the question asks you to find the PERIMETER of the triangle, you are looking to figure out the distance around the outside of the triangle. You find the perimeter of triangles simply by adding the length of the three sides together. Then the correct answer here is , or 80 cm.

Because the question asks you to find the PERIMETER of the triangle, you are looking to figure out the distance around the outside of the triangle. You find the perimeter of triangles simply by adding the length of the three sides together. So the correct answer here is , or .

Because the question asks you to find the PERIMETER of the triangle, you are looking to figure out the distance around the outside of the triangle. You find the perimeter of triangles simply by adding the length of the three sides together. So the correct answer here is , or cm.

Because the question asks you to find the PERIMETER of the triangle, you are looking to figure out the distance around the outside of the triangle. You find the perimeter of triangles simply by adding the length of the three sides together. So the correct answer here is , or .

Because the question asks you to find the PERIMETER of the triangle, you are looking to figure out the distance around the outside of the triangle. You find the perimeter of triangles simply by adding the length of the three sides together. So the correct answer here is , or .

Because the question asks you to find the PERIMETER of the triangle, you are looking to figure out the distance around the outside of the triangle. You find the perimeter of triangles simply by adding the length of the three sides together. So the correct answer here is , or .

Since an equilateral triangle has three equal sides, the total perimeter of the triangle is units, since each side is units long and .

We know two of the lengths of the triangle's sides: and . We are also told that its third side's length is an average of its other two sides. We can find the average of and by adding them together and dividing by two: and , so the triangle's third side has a length of . We can now find the perimeter of the triangle by adding up the lengths of its sides: , so the perimeter of the triangle is .