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ISEE Lower Level Math : How to find the perimeter of a triangle

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Example Questions

Example Question #371 : Geometry

Use the following triangle to answer the question:

Triangle2

Find the perimeter.

Possible Answers:

$17\text{cm}$

$33\text{cm}$

$29\text{cm}$

$36\text{cm}$

$72\text{cm}$

Correct answer:

$29\text{cm}$

Explanation:

To find the perimeter of a triangle, we will use the following formula:

$\text{perimeter of triangle} = a+b+c$

where a, b, and c are the lengths of the sides of the triangle.

Now, let's look at the triangle.

Triangle2

We can see it has sides with lengths of 11cm, 6cm, and 12cm.

Knowing this, we can substitute into the formula. We get

$\text{perimeter of triangle} = 11\text{cm} + 6\text{cm} + 12\text{cm}$

$\text{perimeter of triangle} = 29\text{cm}$

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Example Question #372 : Geometry

Find the perimeter of an equilateral triangle with a base of 6in.

Possible Answers:

$18\text{in}$

$16\text{in}$

$36\text{in}$

$12\text{in}$

$\text{There is not enough information to solve the problem.}$

Correct answer:

$18\text{in}$

Explanation:

To find the perimeter of a triangle, we will use the following formula:

$\text{perimeter of triangle} = a+b+c$

where a, b, and c are the lengths of the sides of the triangle.

Now, we know the base of the triangle is 6in. Because it is an equilateral triangle, we know that all sides are equal. Therefore, all sides are 6in.

Knowing this, we can substitute into the formula. We get

$\text{perimeter of triangle} = 6\text{in} + 6\text{in} + 6\text{in}$

$\text{perimeter of triangle} = 18\text{in}$

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Example Question #362 : Plane Geometry

Use the following triangle to answer the question:

Triangle7

Find the perimeter.

Possible Answers:

$24\text{cm}$

$16\text{cm}$

$32\text{cm}$

$12\text{cm}$

$18\text{cm}$

Correct answer:

$18\text{cm}$

Explanation:

To find the perimeter of a triangle, we will use the following formula:

$\text{perimeter of triangle} = a+b+c$

where a, b, and c are the lengths of the sides of the triangle.

Now, given the triangle

Triangle7

we can see it has sides of length 8cm, 4cm, and 6cm.

Knowing this, we can substitute into the formula. We get

$\text{perimeter of triangle} = 8\text{cm} + 4\text{cm} + 6\text{cm}$

$\text{perimeter of triangle} = 18\text{cm}$

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Example Question #1312 : Isee Lower Level (Grades 5 6) Mathematics Achievement

Find the perimeter of an equilateral triangle with a base of 5in.

Possible Answers:

$\text{There is not enough information to solve the problem.}$

$25\text{in}^2$

$15\text{in}^2$

$25\text{in}$

$15\text{in}$

Correct answer:

$15\text{in}$

Explanation:

To find the perimeter of a triangle, we will use the following formula:

$\text{perimeter of triangle} = a+b+c$

where a, b, and c are the lengths of the sides of the triangle.

Now, we know the base of the triangle is 5in. Because it is an equilateral triangle, we know that all sides are equal. Therefore, all sides are 5in.

Knowing this, we can substitute into the formula. We get

$\text{perimeter of triangle} = 5\text{in} + 5\text{in} + 5\text{in}$

$\text{perimeter of triangle} = 15\text{cm}$

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Example Question #41 : How To Find The Perimeter Of A Triangle

An isosceles triangle measures inches along its two equal sides, and inches along its third side. What is the perimeter of the triangle?

Possible Answers:

$\textup{in.}$

Correct answer:

$\textup{in.}$

Explanation:

To find the perimeter of any object, simply add the length of each side together. For the triangle above, add the equal side twice (there are two of them). The best answer is:

6 + 6 + 13 = 25

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Example Question #42 : How To Find The Perimeter Of A Triangle

An isosceles triangle measures inches along its two equal sides, and inches along its third side. What is the perimeter of the triangle?

Possible Answers:

$\textup{in.}$

Correct answer:

$\textup{in.}$

Explanation:

To find the perimeter of any object, simply add the length of each side together. The best answer is:

8 + 8 + 21 = 37 inches

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Example Question #43 : How To Find The Perimeter Of A Triangle

An equilateral triangle measures 6.5 inches along its three equal sides. What is the perimeter of the triangle?

Possible Answers:

$\textup{in.}$

19.8 $\textup{in.}$

20.5 $\textup{in.}$

18.5 $\textup{in.}$

19.5 $\textup{in.}$

Correct answer:

19.5 $\textup{in.}$

Explanation:

To find the perimeter of any object, simply add the length of each side together. In the case of an equilateral triangle, because all three sides are equal, and there are three of them, you can also multiply the side length by three. The best answer is:

6.5 * 3 = 19.5 inches

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Example Question #44 : How To Find The Perimeter Of A Triangle

An equilateral triangle measures 7.2 inches along its three equal sides. What is the perimeter of the triangle?

Possible Answers:

26.2 $\textup{in.}$

21.2 $\textup{in.}$

26.6 $\textup{in.}$

21.6 $\textup{in.}$

20.6 $\textup{in.}$

Correct answer:

21.6 $\textup{in.}$

Explanation:

7.2 * 3 = 21.6 inches

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Example Question #41 : How To Find The Perimeter Of A Triangle

Find the perimeter of an equilateral triangle with a base of 18in.

Possible Answers:

$\text{There is not enough information to solve the problem.}$

$36\text{in}$

$72\text{in}$

$27\text{in}$

$54\text{in}$

Correct answer:

$54\text{in}$

Explanation:

To find the perimeter of a triangle, we will use the following formula:

$\text{perimeter of triangle} = a+b+c$

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 18in. Because it is an equilateral triangle, all lengths are the same. Therefore, all lengths are 18in.

Knowing this, we can substitute into the formula. We get

$\text{perimeter of triangle} = 18\text{in} +18\text{in} +18\text{in}$

$\text{perimeter of triangle} = 54\text{in}$

Report an Error

Example Question #1321 : Isee Lower Level (Grades 5 6) Mathematics Achievement

Find the perimeter of an equilateral triangle with a base of 14in.

Possible Answers:

$36\text{in}$

$\text{There is not enough information to solve the problem.}$

$28\text{in}$

$42\text{in}$

$46\text{in}$

Correct answer:

$42\text{in}$

Explanation:

To find the perimeter of a triangle, we will use the following formula:

$\text{perimeter of triangle} = a+b+c$

where a, b, and c are the lengths of the sides of the triangle.

Now, we know the base of the triangle is 14in. Because it is an equilateral triangle, all sides are equal. Therefore, all sides are 14in.

Knowing this, we can substitute into the formula. We get

$\text{perimeter of triangle} = 14\text{in} + 14\text{in} + 14\text{in}$

$\text{perimeter of triangle} = 42\text{in}$

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ISEE Lower Level Math : How to find the perimeter of a triangle

Study concepts, example questions & explanations for ISEE Lower Level Math

All ISEE Lower Level Math Resources

Example Questions

Example Question #371 : Geometry

Example Question #372 : Geometry

Example Question #362 : Plane Geometry

Example Question #1312 : Isee Lower Level (Grades 5 6) Mathematics Achievement

Example Question #41 : How To Find The Perimeter Of A Triangle

Example Question #42 : How To Find The Perimeter Of A Triangle

Example Question #43 : How To Find The Perimeter Of A Triangle

Example Question #44 : How To Find The Perimeter Of A Triangle

Example Question #41 : How To Find The Perimeter Of A Triangle

Example Question #1321 : Isee Lower Level (Grades 5 6) Mathematics Achievement

All ISEE Lower Level Math Resources

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