# Eureka Math Geometry Module 1 Lesson 6 Answer Key

## Engage NY Eureka Math Geometry Module 1 Lesson 6 Answer Key

### Eureka Math Geometry Module 1 Lesson 6 Example Answer Key

Example
Find the measure of each labeled angle. Give a reason for your solution.

### Eureka Math Geometry Module 1 Lesson 6 Exercise Answer Key

Opening Exercise
Determine the measure of the missing angle in each diagram.

What facts about angles did you use?
Answers may include the following: vertical angles are equal in measure; linear pairs form supplementary angles; angles at a point sum to 360Â°.

Discussion
Two angles âˆ AOC and âˆ COB, with a common side $$\overrightarrow{O C}$$, are __ if C belongs to the interior of âˆ AOB.
The sum of angles on a straight line is 180Â°, and two such angles are called a linear pair. Two angles are called supplementary if the sum of their measures is __; two angles are called complementary if the sum of their measures is ___. Describing angles as supplementary or complementary refers only to the measures of their angles. The positions of the angles or whether the pair of angles is adjacent to each other is not part of the definition.
Two angles âˆ AOC and âˆ COB, with a common side $$\overrightarrow{O C}$$, are adjacent angles if C belongs to the interior of âˆ AOB. The sum of angles on a straight line is 180Â°, and two such angles are called a linear pair. Two angles are called supplementary if the sum of their measures is 180Â°; two angles are called complementary if the sum of their measures is 90Â°. Describing angles as supplementary or complementary refers only to the measures of their angles. The positions of the angles or whether the pair of angles is adjacent to each other is not part of the definition.

In the figure, line segment AD is drawn.
Find mâˆ DCE.
mâˆ DCE=18Â°

The total measure of adjacent angles around a point is __.
The total measure of adjacent angles around a point is 360Â°.

Find the measure of âˆ HKI.
mâˆ HKI=80Â°

Vertical angles have __ measure. Two angles are vertical if their sides form opposite rays.
Vertical angles have equal measure. Two angles are vertical if their sides form opposite rays.
Find mâˆ TRV.
mâˆ TRV=52Â°

Exercises
In the figures below, $$\overline{A B}$$, $$\overline{C D}$$, and $$\overline{E F}$$ are straight line segments. Find the measure of each marked angle, or find the unknown numbers labeled by the variables in the diagrams. Give reasons for your calculations. Show all the steps to your solutions.

Exercise 1.

mâˆ a=36Â°
Linear pairs form supplementary angles.

Exercise 2.

mâˆ b=47Â°
Consecutive adjacent angles on a line sum to 180Â°.

Exercise 3.

mâˆ c=14Â°
Consecutive adjacent angles on a line sum to 180Â°

Exercise 4.

mâˆ d=49Â°
Consecutive adjacent angles on a line sum to 180Â°

Exercise 5.

mâˆ g=29Â°
Angles at a point sum to 360Â°.

For Exercises 6â€“12, find the values of x and y. Show all work.

Exercise 6.

x=80
Angles at a point sum to 360Â°.

Exercise 7.

x=30; y=90
Vertical angles are equal in measure.
Angles at a point sum to 360Â°.

Exercise 8.

x=20
Vertical angles are equal in measure.
Consecutive adjacent angles on a line sum to 180Â°.

Exercise 9.

x=39; y=123
Vertical angles are equal in measure. Angles at a point sum to 360Â°.

Exercise 10.

x=80; y=122
Consecutive adjacent angles on a line sum to 180Â°.

Exercise 11.

x=10; y=112
Consecutive adjacent angles on a line sum to 180Â°. Vertical angles are equal in measure.

Exercise 12.

x=27; y=47
Consecutive adjacent angles on a line sum to 180Â°. Vertical angles are equal in measure.

### Eureka Math Geometry Module 1 Lesson 6 Problem Set Answer Key

In the figures below, $$\overline{A B}$$ and $$\overline{C D}$$ are straight line segments. Find the value of x and/or y in each diagram below.
Show all the steps to your solutions, and give reasons for your calculations.

Question 1.

x=133
y=43
Angle addition postulate Linear pairs form supplementary angles.

Question 2.

x=78
Consecutive adjacent angles on a line sum to 180Â°.

Question 3.

x=20
y=110
Consecutive adjacent angles on a line sum to 180Â°. Vertical angles are equal in measure.

### Eureka Math Geometry Module 1 Lesson 6 Exit Ticket Answer Key

Use the following diagram to answer the questions below:

Question 1.
Name an angle supplementary to âˆ HZJ, and provide the reason for your calculation.
âˆ JZF or âˆ HZG
Linear pairs form supplementary angles.

b. Name an angle complementary to âˆ HZJ, and provide the reason for your calculation.
âˆ JZA
The angles sum to 90Â°.

Question 2.
If mâˆ HZJ=38Â°, what is the measure of each of the following angles? Provide reasons for your calculations.
a. mâˆ FZG