SSAT Middle Level Math : How to find perimeter of a triangle
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Example Questions
Example Question #1 : Triangles
Find the perimeter of a triangle with sides 
Perimeter involves adding up all of the sides of the shapes; in this case, it's a triangle. Perimeter equals 
Example Question #2 : Triangles
A right triangle has legs 
The length of the hypotenuse of the triangle can be found using the Pythagorean Theorem. Substitute 
Its perimeter is 
Example Question #3 : Triangles
An equilateral triangle has perimeter 
An equilateral triangle has three sides of equal measure, so divide its perimeter by 
Example Question #31 : Triangles
Find the perimeter of an equilateral triangle with a base of 11in.
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 equilateral triangle is 11in. Because it is an equilateral triangle, all sides are equal. Therefore, all sides are 11in.
So, we can substitute. We get
Example Question #31 : Triangles
Which of these choices can the perimeter of an isosceles triangle possibly be if you know that two sides have lengths 12 and 13?
An isosceles triangle has two sides of equal length. If two sides of an isoscelese triangle are of length 12 and 13, then the third must be of length 12 or 13.
This makes the perimeter either
or
Of our choices, we choose 38.
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