LINES AND ANGLES | RELATION BETWEEN ANGLES | Adjacent angles, Linear Pair of Angles, If a ray stands on a line; then the sum of the adjacent angles so formed is `180^@`, If the sum of the two adjacent angles is `180^@`; then their non-common arms are two oppposite rays., The sum of all angles around a point is equal to `360^@`, Vertically oppposite angles, If two lines intersect; then the vertically opposite angles are equal.