Which of the following pair of straight lines intersect at right angle?

Which one of the following pair of straight lines are parallel?

Which of the following pair of straight lines donot represent intersecting lines ?

Angle between pair of straight line

If two lines intersect, do they always intersect at right angles?

In the following figures, let's identify, which two strainght lines have intersected at right angles.

A pair of straight lines drawn through the origin form with the line 2x+3y=6 an isosceles triangle right - angled at the origin . Find the equations of the pair of the straight lines and the area of the triangle correct to two places of decimals.

Condition that a pair of lines are at right angle is

State which of the following pairs of line segments or rays appear to be parallel/ intersecting :