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Honors geometry 1-3

Honors geometry 1-3. Quick quiz. Classify each statement as True or False All points on a line are coplanar. A line has one endpoint Two lines intersect in 2 points. The edge of a plane is a line. Definitions. Segment Addition Postulate If B is between A and C, then AB + BC = AC

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Honors geometry 1-3

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  1. Honors geometry 1-3

  2. Quick quiz • Classify each statement as True or False • All points on a line are coplanar. • A line has one endpoint • Two lines intersect in 2 points. • The edge of a plane is a line.

  3. Definitions • Segment Addition Postulate • If B is between A and C, then AB + BC = AC • Congruent • Two objects that have the same size and shape (angles, segments, triangles, etc.) • Congruent segments • Segments that have equal length • Ex. If AB = CD, then we say AB ≅ CD • This means “ AB is congruent to CD.

  4. More defs. • Midpoint of a segment • The point that divides a segment into 2 congruent (≅) parts. • Ex. If B is the midpoint of AC, then AB ≅ BC • Bisector of a segment • A line, ray, segment or plane that intersects a segment at its midpoint. • This makes 2 ≅ segments A B C

  5. Using the defs and postulates A B 1. Find the coordinate of the midpoint of AB. 2. Draw XA and YZ so that YZ intersects XA at Y and Y is midpoint of XA. More---- -5 12

  6. Try these Fill in the blank with always, sometimes, or never. • The length of a segment is ______ negative. • If point S is between points R and V, then S always lies on RV. • A ray _______ has a midpoint. • AB and BA _______ denote the same ray.

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