GeoGebra Classroom

Circle Equation Anatomy and Exploration

Interact with this app for a minute or two. Be sure to move any LARGE POINT(S) you see around! Then answer the questions that follow.

What do you notice about the equation of a circle (in the upper left corner)? Does it look like any other equation we've seen in the past? If so, describe!

What would the equation of circle with center (0,0) and radius = 9 be?

Select all that apply
• A
• B

If a circle graph has equation , what would its radius be?

Select all that apply
• A
• B

Interact with this app for a minute or two. Be sure to move any LARGE POINT(S) you see around! Then answer the questions that follow.

Suppose a circle has center and has a radius of . What would its equation be?

Select all that apply
• A
• B
• C
• D

Suppose a circle has center and has a radius of . What would its equation be?

Select all that apply
• A
• B
• C
• D

Suppose a circle has center and has a radius of . What would its equation be?

Select all that apply
• A
• B
• C
• D