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.
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
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-
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.