SSAT Elementary Level Math : How to find the perimeter of a triangle

Study concepts, example questions & explanations for SSAT Elementary Level Math

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Example Questions

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Example Question #31 : How To Find The Perimeter Of A Triangle

Find the perimeter of the triangle shown below:

Screen shot 2015 11 03 at 3.29.15 pm

Possible Answers:

Correct answer:

Explanation:

The perimeter is the sides added together. 

Example Question #32 : How To Find The Perimeter Of A Triangle

Use the following to answer the question.

Triangle2

Find the perimeter of the triangle.

Possible Answers:

Correct answer:

Explanation:

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.

 

So, in the triangle

Triangle2

we can see the lengths of the sides are 11cm, 12cm, and 6cm.  Knowing this, we can substitute into the formula.  We get

Example Question #33 : How To Find The Perimeter Of A Triangle

Find the perimeter of an equilateral triangle with a base of 16in.

Possible Answers:

Correct answer:

Explanation:

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

Example Question #34 : How To Find The Perimeter Of A Triangle

The perimeter of an equilateral triangle is 27in.  Find the length of one side of the triangle.

Possible Answers:

Correct answer:

Explanation:

To find the perimeter of an equilateral triangle, we will use this formula:

where a is the length of one side.  Now, to find the length of one side, we will solve for a

We know the perimeter of the triangle is 27in.  So, we will substitute.  We get

 

Therefore, the length of one side of the triangle is 9in.

Example Question #35 : How To Find The Perimeter Of A Triangle

Use the following triangle to solve the problem:

Triangle2

Find the perimeter.

Possible Answers:

Correct answer:

Explanation:

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

Triangle2

we can see it has sides of length 11cm, 6cm, and 12cm.  So, we can substitute.  We get

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