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

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

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Example Questions

Example Question #591 : Geometry

The area of a triangle is \(\displaystyle 240\), and the base of the triangle is \(\displaystyle 30\). What is the height for this triangle?

Possible Answers:

\(\displaystyle 24\)

\(\displaystyle 16\)

\(\displaystyle 8\)

\(\displaystyle 32\)

Correct answer:

\(\displaystyle 16\)

Explanation:

Use the formula to find the area of a triangle.

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

Now, plug in the values for the area and the base to solve for height \(\displaystyle h\).

\(\displaystyle 240=\frac{30 \times h}{2}\)

\(\displaystyle 480=30h\)

\(\displaystyle h=16\)

The height of the triangle is \(\displaystyle 16\).

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

A triangle has an area of \(\displaystyle 360m^2\) and a base of \(\displaystyle 60m\). In meters, find the height.

Possible Answers:

\(\displaystyle 18m\)

\(\displaystyle 24m\)

\(\displaystyle 6m\)

\(\displaystyle 12m\)

Correct answer:

\(\displaystyle 12m\)

Explanation:

Use the formula to find the area of a triangle.

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

Now, plug in the values for the area and the base to solve for height \(\displaystyle h\).

\(\displaystyle 360=\frac{60\times h}{2}\)

\(\displaystyle 720=60h\)

\(\displaystyle h=12\)

The height of the triangle is \(\displaystyle 12\) meters.

Example Question #61 : Acute / Obtuse Triangles

A triangle has an area of \(\displaystyle 45\) and a base of \(\displaystyle 15\). Find the height.

Possible Answers:

\(\displaystyle 12\)

\(\displaystyle 9\)

\(\displaystyle 3\)

\(\displaystyle 6\)

Correct answer:

\(\displaystyle 6\)

Explanation:

Use the formula to find the area of a triangle.

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

Now, plug in the values for the area and the base to solve for height \(\displaystyle h\).

\(\displaystyle 45=\frac{15\times h}{2}\)

\(\displaystyle 90=15h\)

\(\displaystyle h=6\)

The height of the triangle is \(\displaystyle 6\).

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

A triangle has an area of \(\displaystyle 24\) and a base of \(\displaystyle 12\). Find the height.

Possible Answers:

\(\displaystyle 4\)

\(\displaystyle 6\)

\(\displaystyle 2\)

\(\displaystyle 8\)

Correct answer:

\(\displaystyle 4\)

Explanation:

Use the formula to find the area of a triangle.

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

Now, plug in the values for the area and the base to solve for height \(\displaystyle h\).

\(\displaystyle 24=\frac{12\times h}{2}\)

\(\displaystyle 48=12h\)

\(\displaystyle h=4\)

The height of the triangle is \(\displaystyle 4\).

Example Question #153 : Properties Of Triangles

A triangle has an area of \(\displaystyle 54\) and a base of \(\displaystyle 12\). Find the height.

Possible Answers:

\(\displaystyle 15\)

\(\displaystyle 18\)

\(\displaystyle 12\)

\(\displaystyle 9\)

Correct answer:

\(\displaystyle 9\)

Explanation:

Use the formula to find the area of a triangle.

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

Now, plug in the values for the area and the base to solve for height \(\displaystyle h\).

\(\displaystyle 54=\frac{12\times h}{2}\)

\(\displaystyle 108=12h\)

\(\displaystyle h=9\)

The height of the triangle is \(\displaystyle 9\).

Example Question #154 : Properties Of Triangles

A triangle has an area of \(\displaystyle 60\) and a base of \(\displaystyle 12\). Find the height.

Possible Answers:

\(\displaystyle 10\)

\(\displaystyle 5\)

\(\displaystyle 20\)

\(\displaystyle 15\)

Correct answer:

\(\displaystyle 10\)

Explanation:

Use the formula to find the area of a triangle.

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

Now, plug in the values for the area and the base to solve for height \(\displaystyle h\).

\(\displaystyle 60=\frac{12\times h}{2}\)

\(\displaystyle 120=12h\)

\(\displaystyle h=10\)

The height of the triangle is \(\displaystyle 10\).

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

A triangle has an area of \(\displaystyle 24x^2\) and a base of \(\displaystyle 6x\). In terms of \(\displaystyle x\), find the height.

Possible Answers:

\(\displaystyle 6x\)

\(\displaystyle 10x\)

\(\displaystyle 4x\)

\(\displaystyle 8x\)

Correct answer:

\(\displaystyle 8x\)

Explanation:

Use the formula to find the area of a triangle.

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

Now, plug in the values for the area and the base to solve for height \(\displaystyle h\).

\(\displaystyle 24x^2=\frac{6x\times h}{2}\)

\(\displaystyle 48x^2=6x(h)\)

\(\displaystyle h=\frac{48x^2}{6x}=8x\)

The height of the triangle is \(\displaystyle 8x\).

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

A triangle has an area of \(\displaystyle 128y^2\) and a base of \(\displaystyle 16y\). In terms of \(\displaystyle y\), find the height.

Possible Answers:

\(\displaystyle 12y\)

\(\displaystyle 16y\)

\(\displaystyle 20y\)

\(\displaystyle 8y\)

Correct answer:

\(\displaystyle 16y\)

Explanation:

Use the formula to find the area of a triangle.

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

Now, plug in the values for the area and the base to solve for height \(\displaystyle h\).

\(\displaystyle 128y^2=\frac{16y\times h}{2}\)

\(\displaystyle 256y^2=16y(h)\)

\(\displaystyle h=16y\)

The height of the triangle is \(\displaystyle 16y\).

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

A triangle has an area of \(\displaystyle 48a\) and a base of \(\displaystyle 6a\). What is the height?

Possible Answers:

\(\displaystyle 8a\)

\(\displaystyle 16a\)

\(\displaystyle 8\)

\(\displaystyle 16\)

Correct answer:

\(\displaystyle 16\)

Explanation:

Use the formula to find the area of a triangle.

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

Now, plug in the values for the area and the base to solve for height \(\displaystyle h\).

\(\displaystyle 48a=\frac{6a\times h}{2}\)

\(\displaystyle 96a=6a(h)\)

\(\displaystyle h=\frac{96a}{6a}=\frac{96}{6}=16\)

The height of the triangle is \(\displaystyle 16\).

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

A triangle has an area of \(\displaystyle 56t\) and a base of \(\displaystyle 7t\). Find the height.

Possible Answers:

\(\displaystyle 16\)

\(\displaystyle 8\)

\(\displaystyle 8t\)

\(\displaystyle 16t\)

Correct answer:

\(\displaystyle 16\)

Explanation:

Use the formula to find the area of a triangle.

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

Now, plug in the values for the area and the base to solve for height \(\displaystyle h\).

\(\displaystyle 56t=\frac{7t\times h}{2}\)

\(\displaystyle 112t=7t(h)\)

\(\displaystyle h=\frac{112t}{7t}=\frac{112}{7}=16\)

The height of the triangle is \(\displaystyle 16\).

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