If sum of two angles is 180°, they are supplementary.

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For example
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60° + 120° = 180°

Since, sum of both angles is 180°

So, they are supplementary

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Are these angles
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supplementary?
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68° + 132° = 200°

≠ 180°

Since, sum of both the angles is not 180°

So, they are
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not supplementary
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Are these angles supplementary?
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100° + 80° = 180°

Since, sum of both the angles is 180°

So, they are
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supplementary.
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Are these angles supplementary?
**

**
**

135° + 45° = 180°

Since, sum of both the angles is 180°

So, they are
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supplementary.
**

###
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Are these angles supplementary?
**

**
**

110° + 50° = 160°

≠ 180°

Since, sum of both the angles is not 180°

###
**
Are these angles supplementary?
**

**
**

105° + 65° = 170°

≠ 180°

Since, sum of both the angles is not 180°

So, they are
**
not supplementary
**

###
**
Are these angles supplementary?
**

**
**

50° + 130° = 180°

Since, sum of both the angles is not 180°

So, they are
**
not supplementary
**

###
**
Are these angles supplementary?
**

**
**

45° + 45° = 90°

≠ 180°

Since sum of both angle is not 180°

So, they are
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not supplementary
**

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