Observe the following figures and identify the type of angles in them.

No two electric field lines can intersect each other. Why?

Let's find if the following statements are true or false. All the angles of a square are right angles.

Express the following angles in terms of a right angle . 60^@

In the adjoining figure , /_B and /_M of the right angled triangles DeltaABC and DeltaAMP are right angles. Prove that (a) DeltaABC~DeltaAMP , (b) (CA)/(PA)=(BC)/(MP) .

Two uniform infinite planes of charge having charge densities (+sigma) and (-sigma) intersect at right angle. The magnitude of electric field at any position in the space is

Prove that the normal at the extermities of a focal chord of a parabola intersect at right angles.

Ankita drew two circles which intersect each other at the points P and Q. Through the point P two straight lines are draw so that they intersect one of the circle at the points. A and B and the ohte circle at the points C and D respectively. Prove that angle AQC= angle BQD .

Like the adjoining figure, draw two circles with centres C and D which intersect each other at the points A and B . Draw a straight line through A which intersects the circle C at the point P and the circle with centre D at the point Q. Prove that (i) angle PBQ= angle CAD (ii) angle BPC= angle BQD .

Which of the following figures have two lines of symmetry and the angle of rotational symmetry 180.