Bellringer Discuss with your shoulder partner the following situation… • Why does a four-legged chair sometimes wobbles, but a three legged chair never wobbles???
Objective: • I will represent simple geometric shapes like points, lines, segments, rays, and angles using proper identification.
Point • P Drawn: as a dot Named by: a CAPITAL letter Facts: A point has neither shape nor size Words/Symbols: point P
Line n B A Drawn: with an arrowhead at both ends Named by: the letters representing two points on the line or a lowercase script letter Facts: There is exactly one line through any two points Words/Symbols: linen, line AB or , line BA or
Vocabulary • Collinear- • Noncollinear-
Plane T Y X Z Drawn: as a shaded, slanted 4-sided figure Named by: a capital script letter or by the letters naming three noncollinear points Facts: There is exactly one plane through any three noncollinear points Words/Symbols: plane T, plane XYZ, plane XZY, plane YXZ, plane YZX, plane ZXY, plane ZYX
Plane Parallel Planes: Planes that do not intersect
Write Rally Robin Students take turns stating and writing responses or solutions. Record answers on one sheet of paper.
Rally Coach • Partners take turns, one solving a problem while the other coaches. • 1. Partner A solves the first problem. • 2. Partner B watches and listens, checks, coaches if necessary, and praises. • 3. Partner B solves the next problem. • 4. Partner A watches and listens, checks, coaches if necessary, and praises.
Draw and label a figure for each relationship. • Plane R contains lines AB and DE, which intersect at point P. Add point C on plane R so that it is not collinear with AB or DE
QR on a coordinate plane contains Q(-2,4) and R(4,-4). Add point T so that T is collinear with these points.
Space- a boundless, three dimensional set of all points. Space can contain lines and planes
n P Q m W R S T U l F Name a line that contains point P. Name the plane containing lines n and m. Name the intersection of lines n and m. Name a point not contained in lines l, m, or n. What is another name for line n? Does line l intersect line m or line n? Explain.
In review… There are 3 basic terms in geometry Point, Line, and Plane How do we model them? Draw them? Name them? And write them? It’s important…