GeoGebra Classroom

# Complementary & Supplementary Angles (Exploration)

## 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.

Select all that apply
• A
• B
• C
• D

## 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.

Select all that apply
• A
• B
• C
• D

## 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.