The sum of interior angles in a triangle is 180°. To prove \(a + b + c = 180^\circ\), firstly draw a line parallel to one side of the triangle. \(d = b\) (alternate angles are equal ...

The sum of interior angles in a triangle is 180°. To prove \(a + b + c = 180^\circ\), firstly draw a line parallel to one side of the triangle. \(d = b\) (alternate angles are equal ...

Then which of the following statements is correct? (a) Each pair of alternate interior angles is equal. (b) Each pair of corresponding angles is equal. (c) Each pair of interior angles on the same ...