If numbers such as\( \sqrt4 = 2, \sqrt9 = 3\) are considered, Then here, 2 and 3 are rational numbers.
Thus, the square roots of all positive integers are not irrational.
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.