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.

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Presentation transcript:

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.

A B C

A B C

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

A B C CA

A B C

A B C B A

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.

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

Proposition: Bisect a given angle.

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.