1.1 Getting Started

1. 1.1 Getting Started Terms to know!

2. Points • A specific place in space. • Labeled by a capital letter. C B A

3. Lines • Two points connected with a straight line • Made up of many points (must have 2 points to determine a line) • Contains arrows at both ends • Goes on into infinity • Labeled by a lower case letter or by 2 points A B AB m

4. Give all possible names for line l AB AC AD B C D A l CD BC BD

5. Line Segment • Made up of 2 points on a number line but has a beginning and an end. • Labeled by the two end points in either direction. • Symbol does not have arrows at the end. X Y XYYX

6. A B C D E F -1 0 1 2 3 4 • On the number line, name the line segment for the section between 1 and 3 • Between 0 and -1 • Between 2 and 4 • Between -1 and 3 CE BA DF AE

7. Ray • Has a beginning point but no end point. • Named by the beginning point then any other point. • Goes on forever in one direction. A B C AB or AC

8. Angle • Two rays with a common start point. • Vertex: name of the common point. • Sides formed by the rays. • Named by numbers or letters. • Middle letter is always the vertex. • Can be named by vertex when only one angle present. A 1 B C <B <ABC <1

9. Name all of the angles below: <ADB <ADC <BDC <1 <2 A B 1 2 D C

10. ∆Triangle • A triangle has 3 segments as its sides. • A triangle has 3 angles. • Written as BOX. • A triangle is the union of three segments (symbol: U ). B X O BOX = BO U OX U XB

11. Intersection  The intersection of any two sides is the vertex. CAT CA AT = A C A T