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 #5 : Prove Parallelogram Theorems: Ccss.Math.Content.Hsg Co.C.11

Determine whether the statement is true or false:

A rhombus is an example of a parallelogram.

Possible Answers:

True

False

Correct answer:

True

Explanation:

Recall that a parallelogram is a special type of quadrilateral meaning, it is a shape that has four sides with opposite sides being parallel. Along with opposite sides being congruent, a parallelogram has two pairs of opposite angles that are congruent. Lastly, the diagonals of a parallelogram must bisect each other. Since a rhombus has all of these characteristics it too is considered a parallelogram.

Therefore, the statement is true.

Example Question #6 : Prove Parallelogram Theorems: Ccss.Math.Content.Hsg Co.C.11

Determine whether the statement is true or false:

A trapezoid is a parallelogram.

Possible Answers:

False

True

Correct answer:

False

Explanation:

Recall that a parallelogram is a special type of quadrilateral meaning, it is a shape that has four sides with opposite sides being parallel. Along with opposite sides being congruent, a parallelogram has two pairs of opposite angles that are congruent. Lastly, the diagonals of a parallelogram must bisect each other. 

A trapezoid has one set of opposite parallel sides however, they are not congruent. The opposite angles of a trapezoid are also not congruent therefore, the statement is false.

Example Question #1 : Prove Parallelogram Theorems: Ccss.Math.Content.Hsg Co.C.11

Determine whether the statement is true or false:

A quadrilateral  has   therefore,  is a parallelogram.

Possible Answers:

False

True

Correct answer:

False

Explanation:

Recall that a parallelogram is a special type of quadrilateral meaning, it is a shape that has four sides with opposite sides being parallel. Along with opposite sides being congruent, a parallelogram has two pairs of opposite angles that are congruent. Lastly, the diagonals of a parallelogram must bisect each other. 

Since the statement only says that  is an quadrilateral that has . This does not give enough information. A trapezoid has one pair of parallel sides but is not a parallelogram, therefore the statement, "A quadrilateral  has   therefore,  is a parallelogram." is false.

Example Question #5 : Prove Parallelogram Theorems: Ccss.Math.Content.Hsg Co.C.11

Determine whether the statement is true or false:

In the figure , and opposite side lengths are congruent, therefore  is a parallelogram.

Possible Answers:

False

True

Correct answer:

True

Explanation:

Recall that a parallelogram is a special type of quadrilateral meaning, it is a shape that has four sides with opposite sides being parallel and congruent. Along with opposite sides being congruent, a parallelogram has two pairs of opposite angles that are congruent. Lastly, the diagonals of a parallelogram must bisect each other.

Since the angles given represent those in a parallelogram, and the opposite sides are congruent, that makes the figure a parallelogram.

Therefore, the statement is true.

Example Question #8 : Prove Parallelogram Theorems: Ccss.Math.Content.Hsg Co.C.11

Determine whether the statement is true or false.

Bisecting a parallelogram along one of its diagonals creates two congruent triangles.

Possible Answers:

False

True

Correct answer:

True

Explanation:

Given the statement:

"Bisecting a parallelogram along one of its diagonal creates two congruent triangles."

Recall that a parallelogram is a special type of quadrilateral meaning, it is a shape that has four sides with opposite sides being parallel. Along with opposite sides being congruent, a parallelogram has two pairs of opposite angles that are congruent. Lastly, the diagonals of a parallelogram must bisect each other. When a parallelogram is bisected along one of its diagonals it in fact creates two congruent triangles.

Therefore, the statement is true.

Example Question #9 : Prove Parallelogram Theorems: Ccss.Math.Content.Hsg Co.C.11

Determine whether the statement is true or false:

To determine whether a figure is a parallelogram, you only need information on one pair of sides or one pair of angles.

Possible Answers:

False

True

Correct answer:

False

Explanation:

Recall that a parallelogram is a special type of quadrilateral meaning, it is a shape that has four sides with opposite sides being parallel. Along with opposite sides being congruent, a parallelogram has two pairs of opposite angles that are congruent. Lastly, the diagonals of a parallelogram must bisect each other. 

Since the statement gives one pair of sides and one pair of angles but does not specify whether the pairs are opposite it cannot be determined whether the figure is a parallelogram or not.

Example Question #11 : Prove Parallelogram Theorems: Ccss.Math.Content.Hsg Co.C.11

How can a parallelogram be constructed given an isosceles triangle?

Possible Answers:

Draw a reflected isosceles triangle where the base is shared and becomes the diagonal of the parallelogram.

Draw two additional sides that are the same length as the sides of the triangle. The diagonal of the parallelogram will be one of the side lengths of the triangle.

Draw two additional sides that are the same length as the base of the triangle. The diagonal of the parallelogram will be one of the side lengths of the triangle.

A triangle cannot be used to construct a parallelogram.

None of the answers will create a parallelogram.

Correct answer:

Draw a reflected isosceles triangle where the base is shared and becomes the diagonal of the parallelogram.

Explanation:

Recall that a parallelogram is a special type of quadrilateral meaning, it is a shape that has four sides with opposite sides being parallel and congruent. Along with opposite sides being congruent, a parallelogram has two pairs of opposite angles that are congruent. Lastly, the diagonals of a parallelogram must bisect each other. 

Since an isosceles triangle has two side lengths that are equal, if it is reflected over the base a rhombus is created which is a type of parallelogram.

If the isosceles triangle is rotated so that one of the sides is the diagonal of the parallelogram then the opposite sides of the parallelogram are congruent thus making the figure a parallelogram.

If side lengths are added the resulting image will have three equal sides and one side that isn't therefore, the new figure is not a parallelogram.

Thus, looking at the given answer options, "Draw a reflected isosceles triangle where the base is shared and becomes the diagonal of the parallelogram." is the best choice.

Example Question #101 : Congruence

Determine whether the statement is true or false:

In the figure  and  and , therefore  is a parallelogram.

Possible Answers:

False

True

Correct answer:

True

Explanation:

Recall that a parallelogram is a special type of quadrilateral meaning, it is a shape that has four sides with opposite sides being parallel and congruent. Along with opposite sides being congruent, a parallelogram has two pairs of opposite angles that are congruent. Lastly, the diagonals of a parallelogram must bisect each other.

Therefore, the statement is true.

Example Question #1 : Construct Geometric Figures: Ccss.Math.Content.Hsg Co.D.12

How is a square altered to result in a rhombus?

Possible Answers:

Rotate the square 

Change the length of the sides

Change the vertical distance between the two horizontal lines.

A square can never be a rhombus

Change the interior angles.

Correct answer:

Change the interior angles.

Explanation:

Both squares and rhombi are quadrilaterals and parallelograms. Quadrilaterals are four sided figures and parallelograms are figures that have opposite sides that are parallel.

Squares by definition contain four  angles; rhombi on the other hand have two sets of opposite congruent angles. Therefore, for a square to to altered into a rhombus, the interior angles must be altered.

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Example Question #1 : Explain How The Criteria For Triangle Congruence (Asa, Sas, And Sss) Follow From The Definition Of Congruence In Terms Of Rigid Motions.

What is rigid motion?

Possible Answers:

Any way of moving a figure such that the relative distance between the points/vertices of the figure stay the same and the relative position of the points/vertices of the figure stay the same

Any way of moving a figure

Any way of moving a figure such that the relative position of the points/vertices of the figure stay the same but the distance between points/vertices can differ

Any way of moving a figure such that the relative distance between the points/vertices of the figure stay the same but the position can differ

Correct answer:

Any way of moving a figure such that the relative distance between the points/vertices of the figure stay the same and the relative position of the points/vertices of the figure stay the same

Explanation:

Rigid motion follows these criteria because the motion is rigid meaning that everything that is moving stays the same except for the location of the entire figure.  There are three common types of rigid motion; translation, reflection, and rotation.

All Common Core: High School - Geometry Resources

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