Draw a half circle on paper. Now, complete the circle.
Encourage students to draw another half circle to complete the whole.
Are the parts equal? Explain.
Yes. Possible response: Cut along the line. Then turn 1 of the parts so that it faces the same way as the other part. The parts line up on top of each other perfectly; Fold along the line. The parts line up on top of each other perfectly.
Which rectangle shows parts that are all the same exact shape? How can you tell if these are equal parts?
The purple rectangle. Possible response: Cut along the lines. Then stack the parts. They line up on top of each other perfectly.
Which rectangle shows equal parts, where not every part is the same shape?
The pink rectangle. Possible response: Cut along the lines. Stack the ones that have the same shape. Then cut these in half again. You can see that each fourth has 2 equal smaller parts that are the same shape.
What is the difference between a line and a line segment?
Possible response: A line is made up of many, many points. It has arrows on both ends to show that it extends forever in both directions. A line segment is part of a line. It has 2 endpoints. It does not have any arrows.
How many lines are there? Explain.
There are 3 lines. A line can be oriented in any direction.
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