1. LESSON 1: GEOMETRY VOCABULARY
Geometry - branch of mathematics that deals with points, lines, planes and solids and examines their properties.
Basic terms and symbols
Types of Angles
Triangle

2. Basic terms and symbols
Point – has no size; length, width, or height.
Line – set of points which has infinite length but no width or height.
Segment – part of a line that consists of two points called endpoints and all points between them.
Ray- is the part of a line that contains an endpoint and all points extending in the other direction .
Collinear points – points that lie on the same line.
Similar
Congruent
Equal
Concurrent

3. Angles(Definitions) Obtuse angle
An angle whose measure is greater than 90° and less than 180°

4. Triangle

5. Triangle

6. Triangle

7. Homeworks

8. What is the name of the line passing through the orthocenter, circumcenter, and centroid of the triangle?
EULER ‘s LINE