Geometry, derived from the Greek words meaning "earth measurement," is the study of the properties and relations of points, lines, and planes. It includes concepts such as straight lines, rays, line segments, parallel lines, intersecting lines, and perpendicular lines. Each type of line has specific characteristics, such as directionality, endpoints, and angles formed at intersection points.

1. Geometry

2. What is a
Geometry?

3. Geometry means earth
measure. It was derived from
the Greek words “GEO” and
“METRON” which means
Earth Measurement

4. Basic Geometric
concepts

5. Points
- A point is represented by a small dot and
named by capital letter.

6. Lines
- A line is a series of points that extends
continuously in opposite directions.
A
Q R

7. Plane
- A plane consists of infinite set of points and
extends continuously in every direction.

8. KINDS OF LINES

9. KINDS OF LINES

10. STRAIGHT LINE
- A straight line is a line that does not curve.
- A line extends in both directions without end
(infinitely)

11. RAY
- A ray is the part of line consisting of
one endpoint and all the points of the line
one side of the endpoint.

12. Line Segment
- A segment is the part of line consisting
of two endpoints and all points between
them.

13. PARALLEL LINES
- Two lines are parallel if they never meet.
They are always the same distance apart

14. INTERSECTING LINES
- The intersecting lines (two or more)
meet only at one point always.

15. PERPENDICULAR LINES
- If the lines make 2 or 4 right angles (90º) when
they meet in a point, then they are perpendiculars.