SAT II Math I : Geometry

Study concepts, example questions & explanations for SAT II Math I

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Example Questions

Example Question #27 : Surface Area

What is the surface area of a cylinder with height 10 and radius 7?

Possible Answers:

Correct answer:

Explanation:

The formula of the surface area of a cylinder is:

In this problem h is 10 and r is 7. Substituting in those values gives us:

Simplifying and combining the like terms results in:

Example Question #28 : Surface Area

Figure not drawn to scale.

Box example

Find the surface area of the box above.

Possible Answers:

Surface area: 48 yd2

Surface area: 84 yd2

Surface area: 82 yd3

Surface area: 84 yd3

Surface area: 82 yd2

Correct answer:

Surface area: 82 yd2

Explanation:

Box example

You can find the surface area of a box by following the equation below:

The surface area of the box is 82yd(remember that area measurements are square units NOT cubic units)

Example Question #29 : Surface Area

Box 3

The shaded face of the provided rectangular prism is a square. If the surface area of the prism is , give  in terms of .

Possible Answers:

Correct answer:

Explanation:

Since the top face of the prism is a square, the common sidelength - and the missing dimension - is 25.

The surface area  of a rectangular prism with length , width , and height  can be found using the formula

.

Setting, and solving for :

 

Example Question #1 : Faces, Face Area, And Vertices

How many vertices does a polyhedron with twenty faces and thirty edges have?

Possible Answers:

Correct answer:

Explanation:

By Euler's Formula, the relationship between the number of vertices , the number of faces , and the number of edges  of a polyhedron is 

Set  and , and solve for :

The polyhedron has tweve vertices.

Example Question #1 : Faces, Face Area, And Vertices

How many edges does a polyhedron with nine vertices and eleven faces have?

Possible Answers:

Correct answer:

Explanation:

By Euler's Formula, the relationship between the number of vertices , the number of faces , and the number of edges  of a polyhedron is 

Set  and  and solve for :

The polyhedron has eighteen edges.

Example Question #131 : Geometry

A rectangular prism has a height of 4 in., length of 8in., and a width of 7in. Find the volume of the prism.

Possible Answers:

Correct answer:

Explanation:

To find the volume of a rectangular prism we use the equation of:

Now substituting in our values we get:

Example Question #2 : Other 3 Dimensional Geometry

What is the volume of a triangular prism having a base of 2, a height of 8, and second height of 14?

Possible Answers:

Correct answer:

Explanation:

To find the volume of a triangular prism we use the equation 

In our case our 

Therefore,

Example Question #2 : Other 3 Dimensional Geometry

If a cube has a surface area of   then what is the the length of its longest diagonal?

Possible Answers:

Correct answer:

Explanation:

The longest diagonal of a cube transverses the interior of the figure:

Cube diagonal

This distance is defined by the super pythagorean theorem :

where , and  are the length, width, and height. Because the figure is a cube, all three are the same measure, and each is the side of the cube. 

We can use the given surface area to find the length of the side:

   

We can use this value for the side to plug into the super pythagorean theorem

Which can be simplified to

Example Question #1 : How To Graph An Ordered Pair

Which of the following points is in Quadrant IV on the coordinate plane?

Possible Answers:

Two of these points are in Quadrant IV.

Correct answer:

Explanation:

Quadrant IV consists of the points with positive -coordinates and negative -coordinates. Therefore is the correct choice.

Example Question #1 : Parabolas And Circles

Give the axis of symmetry of the parabola of the equation

Possible Answers:

Correct answer:

Explanation:

The line of symmetry of the parabola of the equation

is the vertical line

Substitute :

The line of symmetry is

That is, the line of the equation .

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