SSAT Elementary Level Quantitative › How to find the perimeter of a triangle
Find the perimeter of an equilateral triangle with side length 1.
To solve, simply use the formula for the perimeter of an equilateral triangle. Thus,
Remember, the special property of an equilateral triangle is that all of its sides are the same length so, you can either add the side length 3 times or multiply it by 3.
You can find the perimeter of a triangle if you know __________.
three side lengths
the height and base
the area
its angles
A triangle has the side lengths ,
, and
. What is the perimeter of the triangle?
The perimeter of a triangle is the sum of the three sides.
Add the lengths together to find the perimeter.
What is the PERIMETER of the triangle in the figure?
30 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
.
What is the PERIMETER of the triangle in the figure?
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
.
What shape has only angles?
Triangle
Square
Cube
Pentagon
Hexagon
A triangle is the only shape with angles.
What is the PERIMETER of the triangle in the figure?
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
.
The perimeter of a scalene triangle is 21 mm. Which choice shows the correct side lengths?
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:
Use the following triangle to solve the problem:
Find the perimeter.
To find the perimeter of a triangle, we will use the following formula:
where a, b, and c are the lengths of the sides of the triangle.
Now, given the triangle
we can see it has sides of length 11cm, 6cm, and 12cm. So, we can substitute. We get
Find the perimeter of an equilateral triangle with a base of 16in.
To find the perimeter of a triangle, we will use the following formula:
where a, b, and c are the lengths of the sides of the triangle.
Now, we know the base of the triangle has a length of 16in. Because it is an equilateral triangle, all lengths are the same. Therefore, all lengths are 16in.
Knowing this, we can substitute into the formula. We get