Question

In circle O below, what is the measure of OB?
http://testpak.starssuite.com/files/geo2010/geom_14S_Fig12.jpg

Answer 1

There are two B's labelled...

Answer 2

Presumably they want the OB that extends to the edge of the circle.

Answer 3

So you know the radius is 9. It is the line segment OA.

Answer 4

Next calculate OB (the B from inside the circle) using the pythagorean theorem.

Now you need to use a formula. To get the length of the segment BB you take the radius(9) and subtract is from the apothem(that you just calculated with the pythagorean theorem). Add this to the OB(that you calculated with the pythagorean theorem)....


Wow! B representing two different things made that very difficult to explain!