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HiSET: Math : Reflections

Study concepts, example questions & explanations for HiSET: Math

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Example Questions

Example Question #1 : Understand Transformations In The Plane

What is the result of reflecting the point (2,-2) over the y-axis in the coordinate plane?

Possible Answers:

(2,-2)

(-2,2)

$(-\frac{1}{2},2)$

(-2,-2)

(2,2)

Correct answer:

(-2,-2)

Explanation:

Reflecting a point

(x,y)

over the y-axis geometrically is the same as negating the x-coordinate of the ordered pair to obtain

(-x,y) .

Thus, since our initial point was

(2,-2)

and we want to reflect it over the y-axis, we obtain the reflection by negating the first term of the ordered pair to get

(-2,-2) .

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Example Question #1 : Understand Transformations In The Plane

Symmetry

How many lines of symmetry does the above figure have?

Possible Answers:

One

Two

Four

Infinitely many

None

Correct answer:

One

Explanation:

A line of symmetry of a figure is about which the reflection of the figure is the figure itself. The diagram below shows the only line of symmetry of the figure.

Symmetry

The correct response is one.

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Example Question #3 : Understand Transformations In The Plane

On the coordinate plane, the point A (7, 4) is reflected about the -axis. The image is denoted . Give the distance AA' .

Possible Answers:

$11\sqrt{2}$

$3 \sqrt{2}$

$\sqrt{130}$

Correct answer:

Explanation:

The reflection of the point at (x, y) about the -axis is the point at (x, -y) ; therefore, the image of A (7, 4) is A' (7, -4) . Since these two points have the same -coordinate, the distance between them is the absolute value of the difference between their -coordinates:

AA' = |4 - (-4)| = |8| = 8

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Example Question #2 : Reflections

Consider regular Hexagon ABCDEF ; let and be the midpoints of $\overline{AB}$ and $\overline{DE}$ . Reflect the hexagon about $\overleftrightarrow{AD}$ , then again about $\overleftrightarrow{MN}$ . Which of the following clockwise rotations about the center would result in each point being its own image under this series of transformations?

Possible Answers:

$120^{\circ }$

$180^{\circ }$

$240^{\circ }$

$60^{\circ }$

$300^{\circ }$

Correct answer:

$300^{\circ }$

Explanation:

Refer to the figure below, which shows the reflection of the given hexagon about $\overleftrightarrow{AD}$ ; we will call A ' the image of , call the image of , and so forth.

Hexagon

Now, refer to the figure below, which shows the reflection of the image about $\overleftrightarrow{MN}$ ; we will call A '' the image of , call B' ' the image of , and so forth.

Hexagon

Note that the vertices coincide with those of the original hexagon, and that the images of the points are in the same clockwise order as the original points. Since A '' coincides with , B'' coincides with , and so forth, a clockwise rotation of five-sixth of a complete turn - that is, $\frac{5}{6} \times 360 ^{\circ } = 300 ^{\circ }$ ,

is required to make each point its own image under the three transformations.

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Example Question #1 : Reflections

Consider regular Hexagon ABCDEF ; let and be the midpoints of $\overline{AB}$ and $\overline{DE}$ . Reflect the hexagon about $\overleftrightarrow{BE}$ , then again about $\overleftrightarrow{MN}$ . With which of the following points does the image of under these reflections coincide?

Possible Answers:

Correct answer:

Explanation:

Refer to the figure below, which shows the reflection of about $\overleftrightarrow{BE}$ ; we will call this image A '' .

Hexagon

Note that A '' coincides with . Now, refer to the figure below, which shows the reflection of A '' about $\overleftrightarrow{MN}$ ; we will call this image - the final image -

Hexagon

Note that coincides with , making this the correct response.

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HiSET: Math : Reflections

Study concepts, example questions & explanations for HiSET: Math

All HiSET: Math Resources

Example Questions

Example Question #1 : Understand Transformations In The Plane

Example Question #1 : Understand Transformations In The Plane

Example Question #3 : Understand Transformations In The Plane

Example Question #2 : Reflections

Example Question #1 : Reflections

All HiSET: Math Resources

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