Question

AB is tangent to circle O at B. If AB=9 and AO=21.6, what is the length of the radius (r)?

Answer 1

got picture?

Answer 2

Yeah @jdoe0001

Answer 3

use Pythagoras's theorem

Answer 4

I don't know how to do that very well and I really need help. @surjithayer @jdoe0001

Answer 5

Radius is 20

Answer 6

\(\bf c^2=a^2+b^2\implies \sqrt{c^2-b^2}=b\implies \sqrt{21.6^2-9^2}=a\)

Answer 7

Thats is assuming that Angle ABO is a right angle

Answer 8

it's since the "r" is a radius touching a tangent at the tangency point

Answer 9

Radius is 20...?

Answer 10

19.6? @jdoe0001

Answer 11

yeap

Answer 12

Thank you so much!! Could you help me with some others?