Intermediate Geometry : How to find the height of of an acute / obtuse isosceles triangle

Study concepts, example questions & explanations for Intermediate Geometry

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Example Questions

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Example Question #43 : Isosceles Triangles

An isosceles triangle has a base of 12\ cm and an area of 42\ cm^{2}. What must be the height of this triangle?

Possible Answers:

9\ cm

8\ cm

7\ cm

6\ cm

10\ cm

Correct answer:

7\ cm

Explanation:

A=\frac{1}{2}bh

6x=42

x=7

Example Question #1 : How To Find The Height Of Of An Acute / Obtuse Isosceles Triangle

An isosceles triangle has a perimeter of . If the base of the triangle is two less than two times the length of each leg, what is the height of the triangle?

Possible Answers:

The height of the triangle cannot be determined with the given information.

Correct answer:

Explanation:

First, find the lengths of the triangle.

Let  be the length of each leg. Then, the length of the base must be .

Use the information given about the perimeter to solve for .

Plug this value in to find the length of the base.

Now, recall that the height of an isosceles triangle can split the entire triangle into two congruent right triangle as shown by the figure below.

13

Thus, we can use the Pythagorean Theorem to find the length of the height.

Plug in the given values to find the height of the triangle.

Make sure to round to  places after the decimal.

 

Example Question #2 : How To Find The Height Of Of An Acute / Obtuse Isosceles Triangle

An isosceles triangle has a perimeter of . If the base of the triangle is  less than three times the length of a leg, what is the height of the triangle?

Possible Answers:

Correct answer:

Explanation:

First, find the lengths of the triangle.

Let  be the length of each leg. Then, the length of the base must be .

Use the information given about the perimeter to solve for .

Plug this value in to find the length of the base.

Now, recall that the height of an isosceles triangle can split the entire triangle into two congruent right triangle as shown by the figure below.

13

Thus, we can use the Pythagorean Theorem to find the length of the height.

Plug in the given values to find the height of the triangle.

Make sure to round to  places after the decimal.

 

Example Question #3 : How To Find The Height Of Of An Acute / Obtuse Isosceles Triangle

An isosceles triangle has a perimeter of . If the length of the base is one less than twice the length of a leg, what is the height of the triangle?

Possible Answers:

Correct answer:

Explanation:

First, find the lengths of the triangle.

Let  be the length of each leg. Then, the length of the base must be .

Use the information given about the perimeter to solve for .

Plug this value in to find the length of the base.

Now, recall that the height of an isosceles triangle can split the entire triangle into two congruent right triangle as shown by the figure below.

13

Thus, we can use the Pythagorean Theorem to find the length of the height.

Plug in the given values to find the height of the triangle.

Make sure to round to  places after the decimal.

 

Example Question #4 : How To Find The Height Of Of An Acute / Obtuse Isosceles Triangle

An isosceles triangle has a perimeter of . If the length of the base is fourteen less than three times the length of a leg, what is the height of the triangle?

Possible Answers:

Correct answer:

Explanation:

First, find the lengths of the triangle.

Let  be the length of each leg. Then, the length of the base must be .

Use the information given about the perimeter to solve for .

Plug this value in to find the length of the base.

Now, recall that the height of an isosceles triangle can split the entire triangle into two congruent right triangle as shown by the figure below.

13

Thus, we can use the Pythagorean Theorem to find the length of the height.

Plug in the given values to find the height of the triangle.

Make sure to round to  places after the decimal.

 

Example Question #5 : How To Find The Height Of Of An Acute / Obtuse Isosceles Triangle

An isosceles triangle has a perimeter of . If the length of the base is two less than one-third of the length of a leg, what is the height of the triangle?

Possible Answers:

Correct answer:

Explanation:

First, find the lengths of the triangle.

Let  be the length of each leg. Then, the length of the base must be .

Use the information given about the perimeter to solve for .

Plug this value in to find the length of the base.

Now, recall that the height of an isosceles triangle can split the entire triangle into two congruent right triangle as shown by the figure below.

13

Thus, we can use the Pythagorean Theorem to find the length of the height.

Plug in the given values to find the height of the triangle.

Make sure to round to  places after the decimal.

 

Example Question #6 : How To Find The Height Of Of An Acute / Obtuse Isosceles Triangle

An isosceles triangle has a perimeter of . If the length of the base is ten less than twice the length of a leg, what is the height of the triangle?

Possible Answers:

Correct answer:

Explanation:

First, find the lengths of the triangle.

Let  be the length of each leg. Then, the length of the base must be .

Use the information given about the perimeter to solve for .

Plug this value in to find the length of the base.

Now, recall that the height of an isosceles triangle can split the entire triangle into two congruent right triangle as shown by the figure below.

13

Thus, we can use the Pythagorean Theorem to find the length of the height.

Plug in the given values to find the height of the triangle.

Make sure to round to  places after the decimal.

 

Example Question #7 : Triangles

An isosceles triangle has a perimeter of . If the length of the base is four more than one-third of the length of a leg, what is the height of the triangle?

Possible Answers:

Correct answer:

Explanation:

First, find the lengths of the triangle.

Let  be the length of each leg. Then, the length of the base must be .

Use the information given about the perimeter to solve for .

Plug this value in to find the length of the base.

Now, recall that the height of an isosceles triangle can split the entire triangle into two congruent right triangle as shown by the figure below.

13

Thus, we can use the Pythagorean Theorem to find the length of the height.

Plug in the given values to find the height of the triangle.

Make sure to round to  places after the decimal.

 

Example Question #8 : Triangles

The perimeter of an isosceles triangle is . If the length of the base is five more than one-fourth the length of a leg, what is the height of the triangle?

Possible Answers:

Correct answer:

Explanation:

First, find the lengths of the triangle.

Let  be the length of each leg. Then, the length of the base must be .

Use the information given about the perimeter to solve for .

Plug this value in to find the length of the base.

Now, recall that the height of an isosceles triangle can split the entire triangle into two congruent right triangle as shown by the figure below.

13

Thus, we can use the Pythagorean Theorem to find the length of the height.

Plug in the given values to find the height of the triangle.

Make sure to round to  places after the decimal.

 

Example Question #7 : How To Find The Height Of Of An Acute / Obtuse Isosceles Triangle

The perimeter of an isosceles triangle is . If the length of the base is ten more than one-eighth the length of a leg, what is the height of the triangle?

Possible Answers:

Correct answer:

Explanation:

First, find the lengths of the triangle.

Let  be the length of each leg. Then, the length of the base must be .

Use the information given about the perimeter to solve for .

Plug this value in to find the length of the base.

Now, recall that the height of an isosceles triangle can split the entire triangle into two congruent right triangle as shown by the figure below.

13

Thus, we can use the Pythagorean Theorem to find the length of the height.

Plug in the given values to find the height of the triangle.

Make sure to round to  places after the decimal.

 

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