SSAT Upper Level Math : How to find the perimeter of an acute / obtuse triangle

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

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Example Questions

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Example Question #11 :How To Find The Perimeter Of An Acute / Obtuse Triangle

Find the perimeter of the triangle below:

4

Possible Answers:

Correct answer:

Explanation:

First, find the length of the missing side.

Since the angle measurements in the base of the triangle are the same, this is an isosceles triangle. The side lengths directly across from the equal angles must be the same. Thus, the missing side length is.

Now, to find the perimeter, add up all the side lengths.

Example Question #12 :How To Find The Perimeter Of An Acute / Obtuse Triangle

Find the perimeter of the triangle below:

3

Possible Answers:

Correct answer:

Explanation:

First, find the length of the missing side.

Since the angle measurements in the base of the triangle are the same, this is an isosceles triangle. The side lengths directly across from the equal angles must be the same. Thus, the missing side length is.

Now, to find the perimeter, add up all the side lengths.

Example Question #13 :How To Find The Perimeter Of An Acute / Obtuse Triangle

Find the perimeter of the triangle below:

2

Possible Answers:

Correct answer:

Explanation:

First, find the length of the missing side.

Since there are two angles that are the same, this is an isosceles triangle. The side lengths directly across from the equal angles must be the same. Thus, the missing side length is.

Now, to find the perimeter, add up all the side lengths.

Example Question #14 :How To Find The Perimeter Of An Acute / Obtuse Triangle

Find the perimeter of the triangle below:

1

Possible Answers:

Correct answer:

Explanation:

First, find the length of the missing side.

Since there are two angles that are the same, this is an isosceles triangle. The side lengths directly across from the equal angles must be the same. Thus, the missing side length is.

Now, to find the perimeter, add up all the side lengths.

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