The document presents information about straight lines and coordinates systems. It discusses key concepts such as the Cartesian coordinate system developed by Rene Descartes, which specifies each point in a plane using perpendicular x and y axes. The document also covers the definition of a straight line as the shortest distance between two points, midpoint and centroid formulas, polar coordinates, slope as a measure of a line's steepness, and the general equation of a straight line. The presentation is delivered to a lecturer by five students who each discuss different aspects of straight lines and coordinate systems.

2. Presentation on
The Straight Line

3. Presented to:
Ms. Maimuna Akter
Lecturer
Department of Banking & Insurance
University of Dhaka

4. Sadia Salam Mim
MD. Abir Hasan
Tanvir Mahmud
MD. Rizwanul Hoque
Sadia Afrin Snigdha

5. Now Presenting…
Sadia Salam Mim
ID: 21-046

6. The Cartesian system is a
system that specifies each
point uniquely in a plane by
an ordered paired of
numerical coordinates
which are the signed
distance of two
perpendicular directed
lines, measured in the same
unit of length.

7. Straight Line
A line
Shortest Distance
Integration of Algebra and Geometry
Rene Descartes
(1596-1650)

8. Straight Lines
The shortest distance
between two points is
called straight line.

9. Now Presenting…
MD. Abir Hasan
ID: 21-056

10.  A point in the 2-dimensional
plane is written as P(x,y)
 x is called the abscissa and y
is called the ordinate
 x is the distance of point p
from Y axis
 y is the distance of point p
from x axis

11.  Two mutually perpendicular lines
intersect each other and divide
the plane into four parts
 Each part is called Quadrant
 The intersecting point, is known
as the origin
 The lines are called rectangular
axis

12. Now Presenting…
Tanvir Mahmud
ID: 21-014

13. Distance Between Two Points

14. Coordinates of Mid-point
The coordinate of a mid-point from the
coordinates of any two points is given
by the formula-

15. Now Presenting…
MD. Rizwanul Hoque
ID: 21-084

16. Centroid of a Triangle
The Centroid of a triangle is the
point of intersection of its three
medians.
 Each median bisects the side
opposite to the vertex into two
equal parts.
 The coordinate of the triangle
are-

17. Polar
Coordinates
Polar coordinate
system is used
to determine the
position of any
point in the
plane.

18. Now Presenting…
Sadia Afrin Snigdha
ID: 21-072

19. One of the most important
properties of a straight line
is in how it angles away
from the horizontal. The
concept is reflected in slope
of the line.

20. A number used to represent the
steepness of a line. It also
indicates whether the line is
tilted uphill or downhill. Slope
is represented by the letter m.
M= Y2-Y1/X2-X1 =Difference
of ordinates/difference of
abscissas

21. An equation of the form ax+by+c=0 is
called the general equation of the
straight line.
Where a,b,c are constants and x,y are
variables.

23. Any Query ?