
Show that each angle of a rectangle is a right angle.

Important Questions on Solved Examples

is an isosceles triangle in which . bisects exterior angle and (see Fig.). Show that .

is an isosceles triangle in which . bisects exterior angle and (see Fig.). Show that is a parallelogram.

Two parallel lines and are intersected by a transversal (see Fig.). Show that the quadrilateral formed by the bisectors of interior angles is a rectangle.


is a parallelogram in which and are mid-points of opposite sides and (see Fig.). If intersects at and intersects at , show that is a parallelogram, is a parallelogram and is a parallelogram.

In and are respectively the mid-points of sides and (see Fig.). Show that is divided into four congruent triangles by joining and .

and are three parallel lines intersected by transversals and such that and cut off equal intercepts and on (see Fig. ). Show that and cut off equal intercepts and on also.
