Question

In the figure O is the centre of the circle and ZOAB-50°. What is the measure of ZAOB ? A. 50° B. 80° C. 90° D. 100​

Answer 1

Answer:

Pi is an irrational number, which means that it is a real number that cannot be expressed by a simple fraction. That's because pi is what mathematicians call an "infinite decimal" — after the decimal point, the digits go on forever and ever. ... (These rational expressions are only accurate to a couple of decimal places.)