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Supplementary Angles Worksheet

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Supplementary Angles Worksheet

Name:Date:Class:
1.Two supplementary angles. One angle is . Find the other angle.
42°
2.Two supplementary angles. One angle is . Find the other angle.
11°
3.Two supplementary angles. One angle is . Find the other angle.
45°
4.Two supplementary angles. One angle is . Find the other angle.
120°
5.Two supplementary angles. One angle is . Find the other angle.
129°
6.Two supplementary angles. One angle is . Find the other angle.
136°
7.Two supplementary angles. One angle is . Find the other angle.
110°
8.Two supplementary angles. One angle is . Find the other angle.
155°
9.Two supplementary angles. One angle is . Find the other angle.
131°
10.Two supplementary angles. One angle is . Find the other angle.
57°
11.Two supplementary angles. One angle is . Find the other angle.
53°
12.Two supplementary angles. One angle is . Find the other angle.
25°
13.Two supplementary angles. One angle is . Find the other angle.
29°
14.Two supplementary angles. One angle is . Find the other angle.
16°
15.Two supplementary angles. One angle is . Find the other angle.
11°
16.Two supplementary angles. One angle is . Find the other angle.
63°
17.Two supplementary angles. One angle is . Find the other angle.
170°
18.Two supplementary angles. One angle is . Find the other angle.
53°
19.Two supplementary angles. One angle is . Find the other angle.
118°
20.Two supplementary angles. One angle is . Find the other angle.
90°
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Worked Example

Problem: Two supplementary angles are in ratio 2:3. Find both.

  1. Let angles be 2x and 3x.— Use ratio parts as expressions.
  2. 2x + 3x = 180°, so 5x = 180°— Supplementary angles sum to 180°.
  3. x = 36°, so angles are 72° and 108°.— Divide by 5, then multiply each part.

Answer: 72° and 108°

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