Common Core: High School - Geometry : Congruence

Study concepts, example questions & explanations for Common Core: High School - Geometry

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All Common Core: High School - Geometry Resources

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Example Questions

Example Question #1 : Transformation And Congruence Of Rigid Motions: Ccss.Math.Content.Hsg Co.B.6

 has a rigid motion applied to it that results in . What can be concluded about the relationship between these two triangles.

Possible Answers:

None of the other answers

Correct answer:

Explanation:

A rigid motion is that that preserves the distances while undergoing a motion in the plane. This is also called an isometry, rigid transformations, or congruence transformations and there are four different types.

Regardless of which type of rigid motion occurred, the following is true about the triangles' angles:

The following is also true about the side lengths:

Therefore, of the answer choices  is the correct choice.

Example Question #2 : Transformation And Congruence Of Rigid Motions: Ccss.Math.Content.Hsg Co.B.6

 has a rigid motion applied to it that results in . What can be concluded about the relationship between these two triangles.

Possible Answers:

None of the other answers

Correct answer:

Explanation:

A rigid motion is that that preserves the distances while undergoing a motion in the plane. This is also called an isometry, rigid transformations, or congruence transformations and there are four different types.

Regardless of which type of rigid motion occurred, the following is true about the triangles' angles:

The following is also true about the side lengths:

Therefore, of the answer choices  is the correct choice.

Example Question #3 : Transformation And Congruence Of Rigid Motions: Ccss.Math.Content.Hsg Co.B.6

Determine whether the statement is true or false:

A glide reflection is a synonym for a rigid motion translation.

Possible Answers:

True

False

Correct answer:

False

Explanation:

A glide reflection is a rigid motion that occurs when a figure is translated a certain distance and then reflected or reflected and then translated. 

A translation is a rigid motion describing when a object is moved a certain distance.

A glide reflection contains a translation but it is not a synonym for translation therefore, the statement is false.

Example Question #4 : Transformation And Congruence Of Rigid Motions: Ccss.Math.Content.Hsg Co.B.6

Determine whether the statement is true or false:

All glide reflections are reflections.

Possible Answers:

False

True

Correct answer:

True

Explanation:

A glide reflection is a rigid motion that occurs when a figure is translated a certain distance and then reflected or reflected and then translated. In either case, a glide reflection aways contains a reflection.

Therefore, the statement, "All glide reflections are reflections." is true.

Example Question #5 : Transformation And Congruence Of Rigid Motions: Ccss.Math.Content.Hsg Co.B.6

Sally has a quarter that is face up on the desk. If she slides it to Bob on the other side of the desk and he flips it over so that the tails side is facing up, is it a rigid motion?

Possible Answers:

No

Yes

Correct answer:

Yes

Explanation:

In the situation where Sally has a quarter that is face up on the desk. The coin is the object. Then she slides it to Bob on the other side of the desk and he flips it over so that the tails side is facing up. Therefore, since the coin maintains it shape it is undergoing a translation to reach the other side of the desk and a reflection to flip the coin. This describes a glide reflection which is in fact, a rigid motion.

Therefore, the statement is describing a rigid motion. The answer is "Yes"

Example Question #6 : Transformation And Congruence Of Rigid Motions: Ccss.Math.Content.Hsg Co.B.6

Sally has a quarter that is face up on the desk. Then she slides the coin to Bob on the other side of the desk and he flips it over so that the tails side is facing up. What type of rigid motion does this situation describe?

Possible Answers:

This is not a rigid motion.

Rotation

Reflection

Translation

Glide Reflection

Correct answer:

Glide Reflection

Explanation:

In the situation where Sally has a quarter that is face up on the desk. The coin is the object. Then she slides it to Bob on the other side of the desk and he flips it over so that the tails side is facing up. Therefore, since the coin maintains it shape it is undergoing a translation to reach the other side of the desk and a reflection to flip the coin. This describes a glide reflection which is in fact, a rigid motion.

Example Question #7 : Transformation And Congruence Of Rigid Motions: Ccss.Math.Content.Hsg Co.B.6

Jane and Bob are filling up water balloons for a party they are throwing. Jane thinks the balloons should have more water in them so she fills them fuller. Each water balloon's circumference is one inch greater than before. Does this describe a rigid motion?

Possible Answers:

No

Yes

Correct answer:

No

Explanation:

Recall that a rigid motion is that that preserves the distances between points within the object while undergoing a motion in the plane. This is also called an isometry, rigid transformations, or congruence transformations and there are four different types. The water balloons are the objects in this situation. Since the they are filled with more water to increase their circumferences, it does not preserve the shape of the object and thus, is not a rigid motion. 

Example Question #1 : Transformation And Congruence Of Rigid Motions: Ccss.Math.Content.Hsg Co.B.6

Select the answer that best completes the following definition:

A motion that preserves distance in the plane is called a __________

Possible Answers:

Reflection

Rigid Motion

Rotation

Transformation

Non-Rigid Motion

Correct answer:

Rigid Motion

Explanation:

A rigid motion is that that preserves the distances while undergoing a motion in the plane. This is also called an isometry, rigid transformations, or congruence transformations and there are four different types.

These basic type of rigid motions include the following:

  1. Rotation
  2. Reflection
  3. Translation
  4. Glide Reflection

Therefore, "A motion that preserves distance in the plane is called a rigid motion".

Example Question #51 : Congruence

Jenny has drawn a rectangle in the upper left hand corner of a piece of paper. If she folds the paper in half and traces the rectangle on the other half of the paper, what type of rigid motion has occurred?

Possible Answers:

isometry

Expansion

None of the other answers

Reflection

Rotation

Correct answer:

Reflection

Explanation:

This situation describes a real life application of geometry where the coordinate grid can be seen as the piece of paper. Since Jenny is tracing the rectangle after the paper is folded it can be seen that the fold is an axis and the new rectangle is congruent to the original one. Therefore, the rigid motion describing this situation is a reflection.

Example Question #52 : Congruence

Jill and Jane sit next to each other in math class. Jill has a sheet of paper and Jane asks her for half of it to take notes on because she left her notebook in the locker. If Jill cuts the sheet of paper in half, has a rigid motion occurred?

Possible Answers:

No

Yes

Correct answer:

No

Explanation:

Recall that a rigid motion is that that preserves the distances between points within the object while undergoing a motion in the plane. This is also called an isometry, rigid transformations, or congruence transformations and there are four different types. The piece of paper is the object in this situation. Since the paper is cut in half, it does not preserve the shape of the object and thus, is not a rigid motion. 

Therefore, the answer is "No".

All Common Core: High School - Geometry Resources

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