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