Supplementary Angles (A) - Free Printable

To find the missing angle for each pair, we use the rule for supplementary angles.

Rule: Supplementary angles are two angles that add up to exactly 180°. They form a straight line.

How to solve:
1. Take the total sum: 180°.
2. Subtract the angle you already know.
3. The result is the missing angle.

Let's check the calculations for each problem shown:

1. Given: 94°
* Calculation: $180 - 94 = 86$
* Missing Angle: 86°

2. Given: 43°
* Calculation: $180 - 43 = 137$
* Missing Angle: 137°

3. Given: 65°
* Calculation: $180 - 65 = 115$
* Missing Angle: 115°

4. Given: 45°
* Calculation: $180 - 45 = 135$
* Missing Angle: 135°

5. Given: 75°
* Calculation: $180 - 75 = 105$
* Missing Angle: 105°

6. Given: 158°
* Calculation: $180 - 158 = 22$
* Missing Angle: 22°

7. Given: 90°
* Calculation: $180 - 90 = 90$
* Missing Angle: 90°

8. Given: 129°
* Calculation: $180 - 129 = 51$
* Missing Angle: 51°

Final Answer:
The missing angle measurements are:
1. 86°
2. 137°
3. 115°
4. 135°
5. 105°
6. 22°
7. 90°
8. 51°