Geometry Notes Week 1

Point:It has location and nothing else. No size. No height. No depth. No friends. Line:A straight, unbroken set of points that goes on forever. It has infinite length but no thickness. Plane:A surface with length and width but no thickness. Notes –Vocabulary DAY1

Line Segment:A line that has two endpoints. Ray:A line with ONE endpoint. Notes Vocabulary Coplanar:On the same plane Collinear:On the same line

Ex: What we CAN write: What we CAN’T write: Equal = Numbers AB Congruent Shapes DAY 2 - Congruency

A B C D F G H What do the markings indicate? What type of triangle has been formed? What are two statements of congruency that you can write from the quadrilateral?

Notes - Basic Angles What We Can Write EFD DFE F Vertex:The common endpoint of the two rays of an angle. D F E 1 1

What We Can’t Write F What We Can Write CFE EFC EFD DFE 1 2 D F E C 1 2 CFD DFC Notes - Basic Angles

D F E 2.Notes - Basic Angles

D F E

Angle Bisector:A ray that extends from the vertex of an angle and divides it into two congruent angles. A B C 28° 14° D What We Can Write AD is the angle bisector of BAC. BAD DAC

Midpoint:The point on a segment that’s the same distance from both endpoints. D is the midpoint of BC H is the midpoint of FD A is the midpoint of DE DAY 3 - Midpoint

Midpoint Formula - How do we find the exact center of a line segment? (7,8) (3,2)

2.Notes - Midpoint Formula How do we find the exact center of a line segment? Conjecture 1: Midpoint Conjecture If your points are and then your midpoint is:

(7,8) (3,2) (5,5) 2.Notes - Midpoint Formula Let’s make it work for us.

(-9,2) (7,-6) (-1,-2) 2.Notes - Midpoint Formula One more time.