Find the angles which are equal to `angleP`.

Find the angle which is equal to its complement.

Find the angle which is equal to its suppliment.

Using Huygens principle, show that the angle of incidence is equal to angle of reflection during a plane wave front reflected by a plane surface.

Find the direction cosines of a line which makes equal angles with the coordinate axes.

For a glass prism (n = 1.5) , the angle of prism is equal to the angle of minimum deviation. The angle of prism is nearest to :

Solve the following: In a isosceles traingle, the base angles are equal. The vertex angle is 40^o . What are the base angles of the traingle? (Remember, the sum of three angles of a traingel is 180^o ).

Find counter - examples to disprove the following statements : If the corresponding angles in two triangles are equal, then the triangles are congruent.