Angles

Estimating angles

Name: ______________________________Date: ______________Score: ______ / 20

1.
How many degrees are there in one right angle?
°
2.
How many degrees are there in four right angles?
°
3.
An angle that is a little less than a right angle is about...
1. A45°
2. B80°
3. C150°
4.
An angle between 45° and 90° could be about...
1. A65°
2. B20°
3. C120°
5.
An angle between 0° and 45° could be about...
1. A30°
2. B100°
3. C160°
6.
Is a 110° angle greater or less than a right angle?
1. ALess
2. BGreater
3. CEqual
7.
An angle of 45° is half a right angle.
True False
8.
Which is the best estimate for an angle that looks a bit less than half a right angle?
1. A20°
2. B90°
3. C150°
9.
An angle exactly halfway between a right angle and a straight line is about...
1. A135°
2. B45°
3. C90°
10.
The best estimate for a right angle is...
1. A45°
2. B135°
3. C90°
11.
A full turn is 360°.
True False
12.
Put these angle estimates in order, from smallest to largest.
Write the order (smallest to largest) in the boxes:
- ?135°
- ?45°
- ?90°
13.
Put these angle estimates in order, from smallest to largest.
Write the order (smallest to largest) in the boxes:
- ?175°
- ?10°
- ?65°
14.
What type of angle is 44°?
1. AAcute
2. BRight angle
3. CObtuse
15.
How many degrees is a full turn?
°
16.
Which angle is bigger, 136° or 141°?
1. A136°
2. B141°
17.
What type of angle is 117°?
1. AAcute
2. BRight angle
3. CObtuse
18.
Which angle is bigger, 145° or 33°?
1. A145°
2. B33°
19.
Which angle is bigger, 56° or 132°?
1. A56°
2. B132°
20.
An angle is a little smaller than a right angle. Estimate its size in degrees.
°

Answer key

Angles — Estimating angles

1.90 °
2.360 °
3.B. 80°
4.A. 65°
5.A. 30°
6.B. Greater
7.True
8.A. 20°
9.A. 135°
10.C. 90°
11.True
12.45°, 90°, 135°
13.10°, 65°, 175°
14.A. Acute
15.360 °
16.B. 141°
17.C. Obtuse
18.A. 145°
19.B. 132°
20.75 °