Straight Line and a Point

IMPORTANT

Straight Line and a Point: Overview

This topic covers concepts, such as, Perpendicular Distance of a Point from a Line, Distance of a Point from a Line Along Another Line, Relative Position of Two Points with Respect to a Line & Position of a Point with Respect to a Triangle etc.

Important Questions on Straight Line and a Point

EASY
IMPORTANT

The line 3x+2y=24 meets the y-axis at A & the x-axis at B. The perpendicular bisector of AB meets the line through (0, -1) parallel to x-axis at C. Then the area ( in square units ) of the triangle ABC is

HARD
IMPORTANT

The equation of the perpendicular bisectors of the sides AB and AC of a  ΔABC are  xy+5=0  and  x+2y=0  respectively. If the point A is  1,2, then the equation of the line BC is.

MEDIUM
IMPORTANT

Consider the triangles with vertices A2, 1, B0, 0 and Ct, 4, t=0, 4. If the maximum and the minimum perimeters of such triangles are obtained at t=α and t=β respectively, then 6α+21β is equal to ___________.

MEDIUM
IMPORTANT

Let the equations of two adjacent sides of a parallelogram ABCD be 2x-3y=-23 and 5x+4y=23. If the equation of its one diagonal AC is 3x+7y=23  and the distance of A from the other diagonal is d, then 50d2 is equal to ______________

HARD
IMPORTANT

A point Px,y moves such that the sum of its distances from the lines 2x-y-3=0 and x+3y+4=0 is 7, then the area bounded by locus of P is

MEDIUM
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Which of the following point lie inside the triangle formed by x+y=5 and the coordinate axes?

MEDIUM
IMPORTANT

The refection of y=x w.r.t. y-axis is

MEDIUM
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If L1,L2 denotes the line x+2y-2=02x+3y+4=0, then

EASY
IMPORTANT

Foot of the perpendicular of 6,8 on the line x=y is 

MEDIUM
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The number of points px,y with natural numbers as coordinates that lie inside the quadrilateral formed by the lines 2x+y=2, x=0, y=0 and x+y=5 is 

MEDIUM
IMPORTANT

If the points A-5, 3, B-1, -1, C3, 2 & D-1, 6 are the vertices of a parallelogram taken in order, then taking BC as the base, find the height of the parallelogram.

MEDIUM
IMPORTANT

In straight lines, prove that the reflection of x, y with respect of x-axis is x, -y using the foot of perpendicular method

EASY
IMPORTANT

Two mutually perpendicular straight lines through the origin form an isosceles triangle with the line 2x+y=5, then the area (in sq. units) of the triangle is

MEDIUM
IMPORTANT

If m and n are the lengths of the perpendicular from the origin to the straight lines whose equations are xcotθ-y=2cosθ and 4x+3y=-5cos2θ (θ(0,π)), respectively, then the value of m2+5n2 is

MEDIUM
IMPORTANT

If the points x,-3x and 3,4 lie on the opposite sides of the line 3x-4y=8, then

HARD
IMPORTANT

If ax2-by2+cxy-50=0 is the reflection of xy=4 in the line y=2x, then the value of 107c-7ab is

MEDIUM
IMPORTANT

The perpendicular distance of the straight line 3x+4y=55 from the origin is ______

MEDIUM
IMPORTANT

If L=0 is the equation of reflected ray of a ray of light along x+3y3=0 about x- axis, then the perpendicular distance of point 2,-1 from L is

MEDIUM
IMPORTANT

Let S be a subset of the plane defined by S=x,y:|x|+2|y|=1. Then, the radius of the smallest circle with centre at the origin and having non-empty intersection with S is

EASY
IMPORTANT

For the following shaded region, the linear constraints are 

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