Here's the question you clicked on:
aroub
Find the values of a and b.
I hope you can all see the 8, b and 5 :)
you can make use of the tangent and secant formula's shown here: http://www.mathwarehouse.com/geometry/circle/tangent-secant-side-length.php
I actually want to solve it using these formulas :P But idk here it's like so complicated here.. there's like 3 segments and idk where is where I just know like the simple ones! A tangent with two segments or something like that :)