ISEE Middle Level Math : How to find the perimeter of a triangle
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Example Questions
Example Question #31 : Geometry
Find the perimeter of an equilateral triangle with a side of length 7in.
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 equilateral triangle has one side of length 7in. Because it is an equilateral triangle, all sides are equal. Therefore, all sides are 7in. So, we can substitute. We get
Example Question #32 : Geometry
Find the perimeter of an equilateral triangle with a base of 13in.
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 is 13in. Because it is an equilateral triangle, all sides are equal. Therefore, all sides are 13in. So, we get
Example Question #33 : Geometry
Find the perimeter of an equilateral triangle with a base of length 9in.
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 9in. Because it is an equilateral triangle, all lengths are the same. Therefore, all lengths are 9in.
Knowing this, we can substitute into the formula. We get
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