SSAT Upper Level Math : Geometry

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

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Example Questions

Example Question #11 : How To Find The Volume Of A Tetrahedron

Find the volume of a regular tetrahedron with side lengths of \(\displaystyle \frac{1}{2}\).

Possible Answers:

\(\displaystyle \frac{4\sqrt2}{3}\)

\(\displaystyle \frac{\sqrt2}{24}\)

\(\displaystyle \frac{\sqrt2}{96}\)

\(\displaystyle \frac{\sqrt2}{48}\)

Correct answer:

\(\displaystyle \frac{\sqrt2}{96}\)

Explanation:

Use the following formula to find the volume of a regular tetrahedron:

\(\displaystyle \text{Volume}=\frac{\sqrt2}{12}side^3\)

Now, plug in the given side length.

\(\displaystyle \text{Volume}=\frac{\sqrt2}{12}(\frac{1}{2})^3\)

\(\displaystyle \text{Volume}=\frac{\sqrt2}{12}(\frac{1}{8})\)

\(\displaystyle \text{Volume}=\frac{\sqrt2}{96}\)

 

 

Example Question #11 : How To Find The Volume Of A Tetrahedron

Find the volume of a regular tetrahedron with side lengths of \(\displaystyle \frac{1}{3}\).

Possible Answers:

\(\displaystyle \frac{\sqrt2}{27}\)

\(\displaystyle \frac{\sqrt2}{12}\)

\(\displaystyle \frac{\sqrt2}{324}\)

\(\displaystyle \frac{\sqrt2}{54}\)

Correct answer:

\(\displaystyle \frac{\sqrt2}{324}\)

Explanation:

Use the following formula to find the volume of a regular tetrahedron:

\(\displaystyle \text{Volume}=\frac{\sqrt2}{12}side^3\)

Now, plug in the given side length.

\(\displaystyle \text{Volume}=\frac{\sqrt2}{12}(\frac{1}{3})^3\)

\(\displaystyle \text{Volume}=\frac{\sqrt2}{12}(\frac{1}{27})\)

\(\displaystyle \text{Volume}=\frac{\sqrt2}{324}\)

 

 

Example Question #671 : Geometry

A given rectangular prism has a length of \(\displaystyle 9\:cm\), a width of \(\displaystyle 5\:cm\), and a height of \(\displaystyle 7\:cm\). What is the volume of the prism?

Possible Answers:

\(\displaystyle 45\:cm^{3}\)

\(\displaystyle 63\:cm^{3}\)

\(\displaystyle 315\:cm^{2}\)

\(\displaystyle 63\:cm^{2}\)

\(\displaystyle 315\:cm^{3}\)

Correct answer:

\(\displaystyle 315\:cm^{3}\)

Explanation:

The volume of a given prism \(\displaystyle V=Bh\), where \(\displaystyle B\) is the base area and \(\displaystyle h\) is the height. For a rectangular prism, the base area \(\displaystyle B=l \times w\), or length times width. Therefore:

\(\displaystyle V=Bh\)

\(\displaystyle V=(l\times w)h\)

Substituting in our known values:

\(\displaystyle V=(9\:cm\times 5\:cm)7\:cm\)

\(\displaystyle V=45\:cm^{2}\times 7\:cm\)

\(\displaystyle V=315\:cm^{3}\)

Example Question #1 : How To Find The Volume Of A Prism

Find the volume of a circular prism with a base radius of \(\displaystyle 11\:cm\) and a height of \(\displaystyle 20\:cm\).

Possible Answers:

\(\displaystyle 440\pi\:cm^{2}\)

\(\displaystyle 2420\pi\:cm^{3}\)

\(\displaystyle 2420\pi\:cm^{2}\)

\(\displaystyle 440\pi\:cm^{3}\)

\(\displaystyle 220\pi\:cm^{3}\)

Correct answer:

\(\displaystyle 2420\pi\:cm^{3}\)

Explanation:

The volume of a given prism \(\displaystyle V=Bh\), where \(\displaystyle B\) is the base area and \(\displaystyle h\) is the height. For a circular prism, the base area \(\displaystyle B=\pi r^{2}\), or pi times the square of the radius. Therefore:

\(\displaystyle V=(\pi r^{2})h\)

Substituting in our known values:

\(\displaystyle V=(\pi (11\:cm)^{2})(20\:cm)\)

\(\displaystyle V=(121\pi\:cm^{2})(20\:cm)\)

\(\displaystyle V=2420\pi\:cm^{3}\)

Example Question #1 : How To Find The Volume Of A Prism

A triangular prism has a triangle base length of \(\displaystyle 4\:cm\), a triangle height length of \(\displaystyle 8\:cm\), and a prism height of \(\displaystyle 12\:cm\). What is the volume of the prism?

Possible Answers:

\(\displaystyle 192\:cm^{3}\)

\(\displaystyle 192\:cm^{2}\)

Not enough information provided

\(\displaystyle 384\:cm^{2}\)

\(\displaystyle 384\:cm^{3}\)

Correct answer:

\(\displaystyle 192\:cm^{3}\)

Explanation:

The volume of a given prism \(\displaystyle V=Bh\), where \(\displaystyle B\) is the base area and \(\displaystyle h\) is the prism height. For a triangular prism, the base area \(\displaystyle B=\frac{1}{2}bh_{2}\), where \(\displaystyle b\) is the base of the triangle and \(\displaystyle h_{2}\) is the height of the triangle (not of the prism).

Therefore, we can substitute the base area equation into the equation for the volume of a prism:

\(\displaystyle V=Bh\)

\(\displaystyle V=(\frac{1}{2}bh_{2})h\)

Substituting in our known values:

\(\displaystyle V=(\frac{1}{2}(4\:cm)(8\:cm))(12\:cm)\)

\(\displaystyle V=(16\:cm^{2})(12\:cm)\)

\(\displaystyle V=192\:cm^{3}\)

Example Question #1 : How To Find The Volume Of A Prism

A given rectangular prism has a length of \(\displaystyle 12\), a width of \(\displaystyle 6\), and a height of \(\displaystyle 8\). What is the volume of the prism?

Possible Answers:

\(\displaystyle 572\)

\(\displaystyle 60\)

\(\displaystyle 574\)

\(\displaystyle 576\)

\(\displaystyle 26\)

Correct answer:

\(\displaystyle 576\)

Explanation:

The volume \(\displaystyle V\) of a rectangular prism is the product of its base area \(\displaystyle A\) and its height \(\displaystyle h\)\(\displaystyle V=Ah\). Since we can determine the base area of the rectangular prism from its length and width, we can rewrite the equation and solve:

\(\displaystyle V=Ah\)

\(\displaystyle V=lwh\)

\(\displaystyle V=(12)(6)(8)\)

\(\displaystyle V=12 \times48\)

\(\displaystyle V=576\)

Example Question #2 : How To Find The Volume Of A Prism

A given rectangular prism has a length of \(\displaystyle 10cm\), a width of \(\displaystyle 7cm\), and a height of \(\displaystyle 15cm\), what is its volume?

Possible Answers:

\(\displaystyle 85cm^{3}\)

\(\displaystyle 525cm^{3}\)

\(\displaystyle 32cm^{3}\)

\(\displaystyle 1050cm^{3}\)

\(\displaystyle 1050cm^{2}\)

Correct answer:

\(\displaystyle 1050cm^{3}\)

Explanation:

The volume \(\displaystyle V\) of a rectangular prism is the product of its base area \(\displaystyle A\) and its height \(\displaystyle h\)\(\displaystyle V=Ah\). Since we can determine the base area of the rectangular prism from its length and width, we can rewrite the equation and solve:

\(\displaystyle V=Ah\)

\(\displaystyle V=lwh\)

\(\displaystyle V=(10)(7)(25)\)

\(\displaystyle V=1050\)

Example Question #1743 : Common Core Math: Grade 5

What is the volume of the shape below? 

Screen shot 2015 07 28 at 3.39.34 pm

Possible Answers:

\(\displaystyle \small 5cm^3\)

\(\displaystyle \small 3cm^3\)

\(\displaystyle \small 6cm^3\)

\(\displaystyle \small 7cm^3\)

\(\displaystyle \small 8cm^3\)

Correct answer:

\(\displaystyle \small 6cm^3\)

Explanation:

The formula for volume of a rectangular prism is \(\displaystyle \small v=l\times w\times h\)

\(\displaystyle \small v=3\times1\times2\)

\(\displaystyle \small v=6cm^3\)

Remember, volume is always labeled as units to the third power. 

Example Question #1 : Apply The Volume Formula: Ccss.Math.Content.5.Md.C.5b

What is the volume of the shape below? 

Screen shot 2015 07 28 at 3.47.24 pm

Possible Answers:

\(\displaystyle \small 10cm^3\)

\(\displaystyle \small 36cm^3\)

\(\displaystyle \small 29cm^3\)

\(\displaystyle \small 26m^3\)

\(\displaystyle \small 15cam^3\)

Correct answer:

\(\displaystyle \small 36cm^3\)

Explanation:

The formula for volume of a rectangular prism is \(\displaystyle \small v=l\times w\times h\)

\(\displaystyle \small v=6\times3\times2\)

\(\displaystyle \small v=36cm^3\)

Remember, volume is always labeled as units to the third power. 

Example Question #2 : Apply The Volume Formula: Ccss.Math.Content.5.Md.C.5b

What is the volume of the shape below? 

Screen shot 2015 07 28 at 3.56.22 pm

Possible Answers:

\(\displaystyle \small 6cm^3\)

\(\displaystyle \small 12cm^3\)

\(\displaystyle \small 14cm^3\)

\(\displaystyle \small 42cm^3\)

\(\displaystyle \small 21cm^3\)

Correct answer:

\(\displaystyle \small 42cm^3\)

Explanation:

The formula for volume of a rectangular prism is \(\displaystyle \small v=l\times w\times h\)

\(\displaystyle \small v=2\times3\times7\)

\(\displaystyle \small v=42cm^3\)

Remember, volume is always labeled as units to the third power. 

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