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Ch. 1.6 & 1.7

Ch. 1.6 & 1.7. Angles. RAYS . Have an end point and go on forever in one direction. F. H. Name: starting point 1 st , then another point 2 nd Ex:. Definition of an angle. two rays with a common endpoint, called the vertex. ray. vertex. ray. Angles and Points.

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Ch. 1.6 & 1.7

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  1. Ch. 1.6 & 1.7 Angles

  2. RAYS • Have an end point and go on forever in one direction F H Name: starting point 1st, then another point 2nd Ex:

  3. Definition of an angle • two rays with a common endpoint, called the vertex ray vertex ray

  4. Angles and Points • Angles can have points in the interior, in the exterior or on the angle.

  5. Naming Angles • Three points on the angle • The vertex • A number

  6. Using three points • The vertex point MUST be the middle letter <CBA or <ABC

  7. Using Vertex • Must be the vertex of ONLY ONE angle • Ex: <B

  8. Using a number • A number written inside the angle close to the vertex AND the number is not the measurement • Ex: <2

  9. Angle Addition Postulate m<1 + m<2 = m<ADC • m<1 means the measure of <1 • m<1 + m<2=? m<ADC = 58.

  10. Angle Bisector • An interior ray of an angle splits the angle into two congruent angles • Since <4  <6, then is an angle bisector.

  11. Example • Draw your own diagram and answer this question: • If is an angle bisector of <PMY and m<PML = 87, then find: • m<PMY = _______ • m<LMY = _______

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