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Name
LESSON
Date
Class
Practice A
7-2 Angles
Name the type of angle shown.
1.
2.
3.
180°
45°
90°
4.
5.
6.
160°
90°
125°
Use a protractor to measure each angle.
7.
8.
9.
Choose the best estimate for each angle’s measure.
11.
10.
A 45°
B 100°
C 80°
D 180°
F 170°
G 180°
H 70°
J 145°
12. Carl is making a desk for his office. One of the angles of the
desk measures greater than 90°. What two types of angles could
that angle be?
13. How many angles make up the capital letter L? What types of
angles are they?
Copyright © by Holt, Rinehart and Winston.
All rights reserved.
17
Holt Middle School Math Course 1
Exploration Recording Sheet
7-2 Angles
Puzzles, Twisters & Teasers
7-1 Is it the Truth?
LESSON
LESSON
Determine which statements are true. Rearrange the letters of
the true statements to solve the riddle.
An angle is formed by two rays that have a common
endpoint. Right angles measure 90° and are shaped like a
letter L. You can estimate an angle measure by comparing
the angle with a right angle.
F
90°
Estimate the measure of each angle. Then measure
the angle with a protractor.
G
0°
D
K
H
Estimate
Actual
1.
Less than 90°
45°
2.
More than 90°
125°
3.
Less than 90°
20°
4.
More than 90°
95°
J
1. R
True
Point G is on !"#
JG .
True
2. O !"#
DH can also be written !"#
HD .
3. B
JKG is a plane.
4. S
GK is a ray.
5. A
A point is named by a capital letter.
6. N
KD is a ray.
7. U
A line segment has only one end point.
8. T
FKG is a plane.
9. C
A line is a straight path that extends without end in all directions.
10. O
True
True
True
Think and Discuss
True
5. Discuss how you estimated the angle measures.
Possible answer: Determined if the angle was larger
True
A ray is named by its endpoint first.
or smaller than 90° and if close to 0° or 180°.
What do you call a song played on an automobile radio?
C
A
A
R
T
O
O
N
14
Copyright © by Holt, Rinehart and Winston.
All rights reserved.
Holt Middle School Math Course 1
Practice A
7-2 Angles
LESSON
Name the type of angle shown.
2.
3.
Use a protractor to measure each angle. Tell what type of
angle it is.
180°
1.
45°
90°
right angle
4.
Holt Middle School Math Course 1
Practice B
7-2 Angles
LESSON
1.
16
Copyright © by Holt, Rinehart and Winston.
All rights reserved.
acute angle
35°; acute
6.
160°
90°
right angle
90°; right
120°; obtuse
Use a protractor to draw an angle with each given measure.
4. 70°
obtuse angle
3.
straight angle
5.
125°
2.
5. 115°
6. 45°
obtuse angle
Use a protractor to measure each angle.
7.
8.
9.
Estimate the measure of each angle, and then use a protractor
to check the reasonableness of your estimate. Possible estimates
35°
90°
7.
120°
8.
are given.
9.
Choose the best estimate for each angle’s measure.
11.
10.
80°; 82°
A 45°
B 100°
C 80°
!
F 170°
!
G 180°
D 180°
H 70°
J 145°
130°; 128°
45°; 47°
10. The frame for a kite has two angles that together form a right
angle. What type of angle is each of those angles? Explain.
They are both acute angles; The sum of the two angles is a right angle,
12. Carl is making a desk for his office. One of the angles of the
desk measures greater than 90°. What two types of angles could
that angle be?
so they each must measure less than 90°.
11. What kinds of angles are in each of the letters in this word? TAXI
an obtuse angle or a straight angle
The T has all right angles; the A has acute and obtuse angles; the X has
13. How many angles make up the capital letter L? What types of
angles are they?
acute and obtuse angles; and the I has one straight angle.
one right angle
Copyright © by Holt, Rinehart and Winston.
All rights reserved.
17
Copyright © by Holt, Rinehart and Winston.
All rights reserved.
Holt Middle School Math Course 1
Copyright © by Holt, Rinehart and Winston.
All rights reserved.
143
18
Holt Middle School Math Course 1
Holt Middle School Math Course 1