Complementary & Supplementary Angles (Exploration)

Topic:
Angles

Complementary Angles

In the applet below, the red angle and the blue angle are said to be complementary angles. Interact with this applet for a minute or two, and answer the questions that appear below it.

1.

In your own words, describe what it means for 2 angles to be complementary angles.

2.

In the applet above, the blue angle is said to be a complement of the red angle, and vice versa. Given this information, determine the complement of a 40 degree angle.

Check all that apply

3.

What is the complement of a 1-degree angle?

4.

What angle measure has a complement whose measure is equal to itself?

Supplementary Angles

In the applet below, the pink angle and the blue angle are said to be supplementary angles. Interact with this applet for a minute or two, and answer the questions that appear below it.

1.

In your own words, describe what it means for 2 angles to be supplementary angles.

2.

In the applet above, the blue angle is said to be a supplement of the pink angle, and vice versa. Given this information, determine the supplement of a 130 degree angle.

Check all that apply

3.

What is the supplement of a 1-degree angle?

4.

What angle measure has a supplement whose measure is equal to itself?

Bonus: Practice

Move the points to change the angles. Work out the missing angles, then check your answer by ticking the "show" box.