1. Circle Geometry

2. Write down as many things as you know about this shape.
Circle Geometry
Write down as many things as you know about this shape.

3. Circle Geometry
1. Radius (r) – The distance from the center of a circle to the outside edge. Plural is radii. 2. Diameter (d) – The distance from one side of a circle to the other, passing through the center. 3. Pi (π) – The ratio of the circumference of a circle to its diameter (C/d). 4. Circumference (C = 2πr or C = πd ) – The distance around a circle. 5. Area (A = πr2) – The space covered by a 2-D circle.

4. Circle Geometry
6. Semi-Circle – Exactly half of a circle. 7. Chord – A line segment joining two points on a curve. 8. Minor Arc – A portion of a circle less than a semi-circle. 9. Major Arc – A portion of a circle equal to, or more than, a semi-circle.

5. Circle Geometry
10. Central Angle – An angle formed by two radii of a circle.
11. Inscribed Angle – An angle formed by two chords which
intersect on the circle.
12. Tangent – A line intersecting a circle at only one point.
13. Circumscribed Angle – An angle outside of a circle formed by
two lines that are tangent to a circle.

6. Circle Geometry
14. Secant – A line intersecting a circle at two points.