Angles Worksheets | Classifying Angles Worksheets - Free Printable

I will solve this problem by classifying each angle as acute, obtuse, right, or straight based on its measurement or visual appearance.

First, let's recall the definitions:
- Acute angle: less than 90°
- Right angle: exactly 90°
- Obtuse angle: greater than 90° but less than 180°
- Straight angle: exactly 180°

Now I'll go through each item:

For items 1-10 (visual angles):
1) This appears to be an obtuse angle (greater than 90°)
2) This appears to be a right angle (90°)
3) This appears to be an obtuse angle (greater than 90°)
4) This appears to be an acute angle (less than 90°)
5) This appears to be an acute angle (less than 90°)
6) This appears to be an obtuse angle (greater than 90°)
7) This appears to be an obtuse angle (greater than 90°)
8) This appears to be a right angle (90°)
9) This appears to be an acute angle (less than 90°)
10) This appears to be an acute angle (less than 90°)

For items 11-20 (angles with given measurements):
11) 84° - acute (less than 90°)
12) 89° - acute (less than 90°)
13) 25° - acute (less than 90°)
14) 50° - acute (less than 90°)
15) 180° - straight (exactly 180°)
16) 166° - obtuse (greater than 90° but less than 180°)
17) 90° - right (exactly 90°)
18) 125° - obtuse (greater than 90° but less than 180°)
19) 149° - obtuse (greater than 90° but less than 180°)
20) 106° - obtuse (greater than 90° but less than 180°)

Let me now provide the final classification for each angle:

1) Obtuse
2) Right
3) Obtuse
4) Acute
5) Acute
6) Obtuse
7) Obtuse
8) Right
9) Acute
10) Acute
11) Acute
12) Acute
13) Acute
14) Acute
15) Straight
16) Obtuse
17) Right
18) Obtuse
19) Obtuse
20) Obtuse