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Circle Geometry

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**Write down as many things as you know about this shape.**

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

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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.

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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.

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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.

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

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