1-the radius of the is 12 so AO is twelve,too.
now you can get help from ThePythagorean Proposition
[tex] {x}^{2} = {16}^{2} + {12}^{2} [/tex]
the answer will be 20
so it means that the ABO triangle is a right triangle. so angle A is a right angle
it means that AB is tangent.
2-
circumference:18.85
area: 28.27
3-
[tex]c > b > a[/tex]
hope this helps
