Zero is a rational number as it can be represented as \(\frac{0}{1}\) or \(\frac{0}{2}\) or \(\frac{0}{3}\) etc.
In Fig. 9.26, A, B, C and D are four points on a circle. AC and BD intersect at a point E such that ∠ BEC = 130° and ∠ ECD = 20°. Find ∠ BAC.