Mammoth Memory

Supplementary and complementary angles

Complementary angles are two angles with a sum of 90°.

Supplementary angles are two angles with a sum of 180°.

Supplement is 180 compliment is 90

C is 90° and S is made up of two C’s, so S must be 180°.

 

Example 1

Here is an example of complimentary angles, they both must equal 90 degrees

40° and 50° are complimentary angles.

 

Example 2

Here is an example of complimentary angles, they both must equal 90 degrees

60° and 30° are complimentary angles.

 

Example 3

Here is an example of supplementary angles they both must equal 180 degrees

140° and 40° are supplementary angles.

 

Example 4

Here is an example of supplementary angles they both must equal 180 degrees

110° and 70° are supplementary angles.

 

Example 5

Here is an example of supplementary angles they both must equal 180 degrees

120° + 60° add up to 180° and so they are supplementary.

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