Grade 4 - Progress in Mathematics

Curves

A simple closed curve is a path that

begins and ends at the same point

and does not cross itself.

Not Simple Not Closed

Use the circle at the right.

4. Name the circle and its center.


5. How many diameters are shown?
   Name the diameters.


6. Is T
   R
   a radius? Explain
   why or why not.


7. Is V
   X
   a radius? Explain 8. How many radii are shown?
   why or why not. Name the radii.

Q

X

R V

T

P

W

S

Simple Closed Curves

Write trueor false. Use the picture below.

9. Some of the simple closed
   curves are green.


10. None of the simple closed
    curves are blue.


11. All circles are simple
    closed curves.


12. None of the simple closed
    curves are red.

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