Question

If (-1,2), (2,-1) and (3.1) are any three vertices of a parallelogram, then
a) a = 2,b=0
b) a=-2, 6=0 c) a=-2, b = 6
d) a=6,b=2​

Answer 1

Answer:

) Main Concepts and Results

Cartesian system

Coordinate axes

Origin

Quadrants

Abscissa

Ordinate

Coordinates of a point

Ordered pair

Plotting of points in the cartesian plane:

• In the Cartesian plane, the horizontal line is called the x-axis and the vertical line

is called the y-axis,

• The coordinate axes divide the plane into four parts called quadrants,

• The point of intersection of the axes is called the origin,

• Abscissa or the x-coordinate of a point is its distance from the y-axis and the

ordinate or the y-coordinate is its distance from the x-axis,

• (x, y) are called the coordinates of the point whose abscissa is x and the ordinate

is y,

• Coordinates of a point on the x-axis are of the for