1. Circles

2. Parts of a Circle
Center

3. Parts of a Circle
Diameter (must go through the center)

4. Parts of a Circle
Radius (half a diameter – from the outside to the center)

5. Parts of a Circle
Sector (like a slice of pizza)

6. Parts of a Circle
Chord (a line that crosses the circle but not through the center)

7. Parts of a Circle
Segment (looks a bit like an orange segment)

8. Parts of a Circle
Circumference (the perimeter of the circle)

9. Parts of a Circle
Arc (part of the circumference)

10. Parts of a Circle
Tangent (a line that touches the circle at a single point on the circumference

11. Parts of a Circle
Semicircle (half a circle)

12. What is this?
Radius

13. What is this?
Semicircle

14. What is this?
Center

15. What is this?
Diameter

16. What is this?
Chord

17. What is this?
Sector

18. What is this?
Circumference

19. What is this?
Segment

20. What is this?
Tangent

21. What is this?
Diameter

22. What is this?
Sector

23. What is this?
Semicircle

24. What is this?
Segment

25. What is this?
Chord

26. What is this?
Tangent

27. What is this?
Arc

28. Homework: Learn these words (meanings & spellings)

29. Parts of a Circle

30. The Parts of a Circle
Write the names of the parts of the circle next to their definition.
A line that crosses a circle, passing through the centre.
A part of the circumference of the circle
A part of a circle formed by two radii and an arc.
A part of a circle formed by a chord and an arc.

31. The Parts of a Circle
Write the names of the parts of the circle next to their definition.
A line from the centre of the circle to a point on the circumference.
The distance around the outside of the circle.
A line that touches the circumference at one point only. It meets the radius at right angles.
A line that joins two points on the circumference of a circle.