Circle A has radius 5, and Circle B has radius 2. If CD = 12 and is a common tangent, what is AB?

Step-by-step explanation:

In the attached diagram

CA=CO+OA

CO=DB

Therefore:

5=2+OA

OA=3 Units

The angle between a tangent line and a radius is 90 degrees. therefore triangle OAB is a right triangle with:

OB=12 units

OA=3 units

Using Pythagoras theorem

1. 0.015625

Step-by-step explanation:

i only know the first one

1/2 x 1/4 x 1/8=0.015625