Basic Geometry : Right Triangles

Study concepts, example questions & explanations for Basic Geometry

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Example Questions

Example Question #1482 : Basic Geometry

If the area of a right triangle is \(\displaystyle 16\), and the base of the right triangle is \(\displaystyle 4\), what is the height of the right triangle?

Possible Answers:

\(\displaystyle 6\)

\(\displaystyle 4\)

\(\displaystyle 8\)

\(\displaystyle 2\)

Correct answer:

\(\displaystyle 8\)

Explanation:

Recall how to find the area of a right triangle:

\(\displaystyle \text{Area}=\frac{1}{2}(\text{base}\times\text{height})\)

Now, we are going to manipulate the equation to solve for height.

\(\displaystyle 2(\text{Area})=\text{base}\times\text{height}\)

\(\displaystyle \text{Height}=\frac{2(\text{Area})}{\text{base}}\)

Now, plug in the information given by the question about the values of the area and base of the triangle to find the height.

\(\displaystyle \text{Height}=\frac{2(16)}{4}=\frac{32}{4}=8\)

Example Question #5 : How To Find The Height Of A Right Triangle

If the area of a right triangle is \(\displaystyle 10\), and the base of the triangle is \(\displaystyle 5\), what is the height of the triangle?

Possible Answers:

\(\displaystyle 5\)

\(\displaystyle 2\)

\(\displaystyle 3\)

\(\displaystyle 4\)

Correct answer:

\(\displaystyle 4\)

Explanation:

Recall how to find the area of a right triangle:

\(\displaystyle \text{Area}=\frac{1}{2}(\text{base}\times\text{height})\)

Now, we are going to manipulate the equation to solve for height.

\(\displaystyle 2(\text{Area})=\text{base}\times\text{height}\)

\(\displaystyle \text{Height}=\frac{2(\text{Area})}{\text{base}}\)

Now, plug in the information given by the question about the values of the area and base of the triangle to find the height.

\(\displaystyle \text{Height}=\frac{2(10)}{5}=\frac{20}{5}=4\)

Example Question #502 : Triangles

If the area of a right triangle is \(\displaystyle 15\), and the base of the triangle is \(\displaystyle 10\), what is the height of the triangle?

Possible Answers:

\(\displaystyle 6\)

\(\displaystyle 3\)

\(\displaystyle 1.5\)

\(\displaystyle 4.5\)

Correct answer:

\(\displaystyle 3\)

Explanation:

Recall how to find the area of a right triangle:

\(\displaystyle \text{Area}=\frac{1}{2}(\text{base}\times\text{height})\)

Now, we are going to manipulate the equation to solve for height.

\(\displaystyle 2(\text{Area})=\text{base}\times\text{height}\)

\(\displaystyle \text{Height}=\frac{2(\text{Area})}{\text{base}}\)

Now, plug in the information given by the question about the values of the area and base of the triangle to find the height.

\(\displaystyle \text{Height}=\frac{2(15)}{10}=\frac{30}{10}=3\)

Example Question #7 : How To Find The Height Of A Right Triangle

If the area of a right triangle is \(\displaystyle 24\), and the base of the triangle is \(\displaystyle 4\), what is the height of the triangle?

Possible Answers:

\(\displaystyle 12\)

\(\displaystyle 8\)

\(\displaystyle 6\)

\(\displaystyle 10\)

Correct answer:

\(\displaystyle 12\)

Explanation:

Recall how to find the area of a right triangle:

\(\displaystyle \text{Area}=\frac{1}{2}(\text{base}\times\text{height})\)

Now, we are going to manipulate the equation to solve for height.

\(\displaystyle 2(\text{Area})=\text{base}\times\text{height}\)

\(\displaystyle \text{Height}=\frac{2(\text{Area})}{\text{base}}\)

Now, plug in the information given by the question about the values of the area and base of the triangle to find the height.

\(\displaystyle \text{Height}=\frac{2(24)}{4}=\frac{48}{4}=12\)

Example Question #8 : How To Find The Height Of A Right Triangle

If the area of a right triangle is \(\displaystyle 45\), and the base of the triangle is \(\displaystyle 10\), what is the height of the triangle?

Possible Answers:

\(\displaystyle 9\)

\(\displaystyle 13.5\)

\(\displaystyle 4.5\)

\(\displaystyle 18\)

Correct answer:

\(\displaystyle 9\)

Explanation:

Recall how to find the area of a right triangle:

\(\displaystyle \text{Area}=\frac{1}{2}(\text{base}\times\text{height})\)

Now, we are going to manipulate the equation to solve for height.

\(\displaystyle 2(\text{Area})=\text{base}\times\text{height}\)

\(\displaystyle \text{Height}=\frac{2(\text{Area})}{\text{base}}\)

Now, plug in the information given by the question about the values of the area and base of the triangle to find the height.

\(\displaystyle \text{Height}=\frac{2(45)}{10}=\frac{90}{10}=9\)

Example Question #9 : How To Find The Height Of A Right Triangle

If the area of a right triangle is \(\displaystyle 20\), and the base of the triangle is \(\displaystyle 1\), what is the height of the triangle?

Possible Answers:

\(\displaystyle 20\)

\(\displaystyle 40\)

\(\displaystyle 10\)

\(\displaystyle 30\)

Correct answer:

\(\displaystyle 40\)

Explanation:

Recall how to find the area of a right triangle:

\(\displaystyle \text{Area}=\frac{1}{2}(\text{base}\times\text{height})\)

Now, we are going to manipulate the equation to solve for height.

\(\displaystyle 2(\text{Area})=\text{base}\times\text{height}\)

\(\displaystyle \text{Height}=\frac{2(\text{Area})}{\text{base}}\)

Now, plug in the information given by the question about the values of the area and base of the triangle to find the height.

\(\displaystyle \text{Height}=\frac{2(20)}{1}=\frac{40}{1}=40\)

Example Question #10 : How To Find The Height Of A Right Triangle

If the area of a right triangle is \(\displaystyle 18\), and the base of the triangle is \(\displaystyle 2\), what is the height of the triangle?

Possible Answers:

\(\displaystyle 9\)

\(\displaystyle 18\)

\(\displaystyle 12\)

\(\displaystyle 20\)

Correct answer:

\(\displaystyle 18\)

Explanation:

Recall how to find the area of a right triangle:

\(\displaystyle \text{Area}=\frac{1}{2}(\text{base}\times\text{height})\)

Now, we are going to manipulate the equation to solve for height.

\(\displaystyle 2(\text{Area})=\text{base}\times\text{height}\)

\(\displaystyle \text{Height}=\frac{2(\text{Area})}{\text{base}}\)

Now, plug in the information given by the question about the values of the area and base of the triangle to find the height.

\(\displaystyle \text{Height}=\frac{2(18)}{2}=\frac{36}{2}=18\)

Example Question #311 : Right Triangles

If the area of a right triangle is \(\displaystyle 30\), and the base of the triangle is \(\displaystyle 4\), what is the height of the triangle?

Possible Answers:

\(\displaystyle 10\)

\(\displaystyle 15\)

\(\displaystyle 20\)

\(\displaystyle 5\)

Correct answer:

\(\displaystyle 15\)

Explanation:

Recall how to find the area of a right triangle:

\(\displaystyle \text{Area}=\frac{1}{2}(\text{base}\times\text{height})\)

Now, we are going to manipulate the equation to solve for height.

\(\displaystyle 2(\text{Area})=\text{base}\times\text{height}\)

\(\displaystyle \text{Height}=\frac{2(\text{Area})}{\text{base}}\)

Now, plug in the information given by the question about the values of the area and base of the triangle to find the height.

\(\displaystyle \text{Height}=\frac{2(30)}{4}=\frac{60}{4}=15\)

Example Question #312 : Right Triangles

If the area of a right triangle is \(\displaystyle 60\), and the base of the triangle is \(\displaystyle 40\), what is the height of the triangle?

Possible Answers:

\(\displaystyle 9\)

\(\displaystyle 12\)

\(\displaystyle 3\)

\(\displaystyle 6\)

Correct answer:

\(\displaystyle 3\)

Explanation:

Recall how to find the area of a right triangle:

\(\displaystyle \text{Area}=\frac{1}{2}(\text{base}\times\text{height})\)

Now, we are going to manipulate the equation to solve for height.

\(\displaystyle 2(\text{Area})=\text{base}\times\text{height}\)

\(\displaystyle \text{Height}=\frac{2(\text{Area})}{\text{base}}\)

Now, plug in the information given by the question about the values of the area and base of the triangle to find the height.

\(\displaystyle \text{Height}=\frac{2(60)}{40}=\frac{120}{40}=3\)

Example Question #313 : Right Triangles

If the area of a right triangle is \(\displaystyle 22\), and the base of the triangle is \(\displaystyle 11\), what is the height of the triangle?

Possible Answers:

\(\displaystyle 3\)

\(\displaystyle 5\)

\(\displaystyle 2\)

\(\displaystyle 4\)

Correct answer:

\(\displaystyle 4\)

Explanation:

Recall how to find the area of a right triangle:

\(\displaystyle \text{Area}=\frac{1}{2}(\text{base}\times\text{height})\)

Now, we are going to manipulate the equation to solve for height.

\(\displaystyle 2(\text{Area})=\text{base}\times\text{height}\)

\(\displaystyle \text{Height}=\frac{2(\text{Area})}{\text{base}}\)

Now, plug in the information given by the question about the values of the area and base of the triangle to find the height.

\(\displaystyle \text{Height}=\frac{2(22)}{11}=\frac{44}{11}=4\)

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