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The distance from any point on a circle to the center is a constant called the radius.

The distance from any point on a circle to the center is a constant called the radius. The length of any line segment from a point on a circle to the center of the circle is a constant called the radius. All radii of a circle are the same length. B. A. C. B. A. C.

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The distance from any point on a circle to the center is a constant called the radius.

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  1. The distance from any point on a circle to the center is a constant called the radius. The length of any line segment from a point on a circle to the center of the circle is a constant called the radius. All radii of a circle are the same length.

  2. B A C

  3. B A C

  4. Alternate interior angles are equal. Vertical Angles are equal. Alternate exterior angles are equal. Corresponding angles are equal.

  5. C A B A C

  6. B C A

  7. B B C A A

  8. Proposition 4. SAS Congruence Theorem If two triangles have two sides and the angle included (formed) by the sides equal, then the triangles are congruent. Remember: things that are congruent are equal, in every respect.

  9. Proposition 5. Base angles of an isosceles triangle are equal.

  10. Proposition: Bisect a given angle.

  11. Propostion 8. SSS Congruence Theorem If two triangles have all three sides equal, then the triangles are congruent. Remember: things that are congruent are equal, in every respect.

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