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Nadine and Diondra were working together to divide a circle into three equal parts. They came up with the diagrams shown below. Tanisha said, “One of these pictures is wrong.” 

A circle divided into three parts by creating sectors from the middle point.A circle divided into 3 parts by two internal parallel lines.

Note: This stoplight icon will appear periodically throughout the text. Problems that display this icon contain errors of some type. 

When you explain why something is a mistake, you are less likely to make the same mistake yourself.

What do you think? Is one picture incorrect? If so, which one? Why?

Try to imagine the separate pieces of a circle being rotated or moved.

Remember that dividing the circle into three equal parts means all three sections should be the same size.