1. 18 – — – (-6)

2. (23 – 3) • (-7)

3. 8X – 24 = -96

4. -3 – 14

5. -8 • 8

6. 2 2/4 + 1 1/3

7. 6 ¼ ÷ 7 ½

16

4

• angle• degrees

• vertex

• congruent angles

• right angle

• Classify angles and identify vertical and adjacent angles.

• Identify complementary and supplementary angles and find missing angle measures.

• acute angle

• obtuse angle

• straight angle

• vertical angles

• adjacent angles

•complementary angles•supplementary angles

Naming Angles

Name the angle at the right.

Use the vertex as the middle letter and a point from each side. FGH or HGF

Use the vertex only.G

Use a number.2

Answer: The angle can be named in four ways: FGH, HGF, G, 2.

1. A

2. B

3. C

4. D

A B C D

0% 0%0%0%

A. RST

B. T

C. 3

D. S

Which of the following is not a name for the angle below?

Classify Angles

Classify the angle as acute, obtuse, right, or straight.

Answer: The angle is exactly 180°, so it is a straight angle.

1. A

2. B

3. C

4. D

A B C D

0% 0%0%0%

A. acute

B. obtuse

C. right

D. straight

Classify the angle as acute, obtuse, right, or straight.

Classify Angles

Classify the angle as acute, obtuse, right, or straight.

Answer: The angle is less than 90°, so it is an acute angle.

1. A

2. B

3. C

4. D

A B C D

0% 0%0%0%

A. acute

B. obtuse

C. right

D. straight

Classify the angle as acute, obtuse, right, or straight.

Since 3 and 5 are opposite angles formed by the intersection of two lines, they are vertical angles.

Since 3 and 4 share a common side and vertex and do not overlap, they are adjacent angles.

Similarly, 4 and 5 are adjacent angles.

Answer: 3 and 5 are vertical angles. 3 and 4 are adjacent angles. 4 and 5 are adjacent angles.

1. A

2. B

3. C

4. D

0% 0%0%0%

For the figure shown, which of the following is true?

A.

B.

C.

D.

Identify Angles

Classify the pair of angles as complementary, supplementary, or neither.

128° + 52° = 180°

Answer: The angles are supplementary.

1. A

2. B

3. C

A B C

0% 0%0%

A. complementary

B. supplementary

C. neither

Classify the pair of angles as complementary, supplementary, or neither.

Identify Angles

Classify the pair of angles as complementary, supplementary, or neither.

x and y form a right angle.

Answer: So, the angles are complementary.

1. A

2. B

3. C0% 0%0%

A. complementary

B. supplementary

C. neither

Classify the pair of angles as complementary, supplementary, or neither.

Find a Missing Angle Measure

ALGEBRA Angles PQS and RQS are supplementary. If mPQS = 56°, find mRQS.

Words The sum of the measures of PQS and RQS is 180°.

Variable Let x represent the measure of RQS.

Equation 56 + x = 180

Find a Missing Angle Measure

Answer: The measure of RQS is 124°.

1. A

2. B

3. C

4. D

A B C D

0% 0%0%0%

A. 22°

B. 67°

C. 157°

D. 337°

Angles MNP and KNP are complementary. If mMNP = 23°, find mKNP.

End of the Lesson