Download Geometry Types of Angles

Name ———————————————————————
SECTION
4
Date ————————————
Geometry
Lesson 3: Types of Angles
An angle is formed when two rays meet at their endpoints.
Notice the angle measures for the four types of angles below.
Acute Angle
Right Angle
less than a right angle;
measures between 0° and 90°
forms a square corner;
measures 90°
Obtuse Angle
Straight Angle
greater than a right angle;
measures between 90° and 180°
forms a straight line;
measures 180°
HINT
All angles measure
between 0° and 180°.
Tell whether each angle is acute, right, obtuse, or straight.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
Name the type of angle for each given angle measure.
13. 90°
14. 45°
15. 72°
16. 89°
17. 120°
18. 180°
19. 98°
20. 20°
21. 160°
22. 23°
23. 126°
24. 50°
McDougal Littell Middle School Math
Remediation Book Lesson 4.3
4. GEOMETRY
3. Types of Angles
Copyright © by McDougal Littell, a division of Houghton Mifflin Company.
Practice: First Try
103
Name ———————————————————————
Date ————————————
Practice: Second Try
Tell whether each angle is acute, right, obtuse, or straight.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17. 28°
18. 180°
19. 90°
20. 94°
21. 99°
22. 160°
23. 85°
24. 100°
25. 135°
26. 60°
Draw a diagram for each description.
27. Draw two lines that intersect to form four right angles.
28. Draw two lines that intersect to form two acute angles and two obtuse angles.
29. Draw three lines to form four right angles, four acute angles, and four obtuse
angles. What shape is formed?
30. Draw four lines to form 16 right angles. What shape is formed?
E
Extend Your Skills
4. GEOMETRY
3. Types of Angles
31. The measure of aDAB is 258 as shown in the figure.
104
What is the measure of aEAC if AE and AC are
2 times longer than AD and AB?
D
D
A
B
Puzzle
The next three letters in the pattern below each have a right angle or an acute angle
in them. What are the next three letters? Why?
O T T F F S S ___ ___ ___
McDougal Littell Middle School Math
Remediation Book Lesson 4.3
A
B
C
Copyright © by McDougal Littell, a division of Houghton Mifflin Company.
Name the type of angle for each given angle measure.
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