Wednesday

July 30, 2014

July 30, 2014

Posted by **Greg** on Friday, April 29, 2011 at 11:27am.

Thanks so much!

- Math -
**Reiny**, Friday, April 29, 2011 at 2:19pmWhere does point E enter the picture?

It is supposed to be a point of tangency, is it the point where the two circles are "connected" ?

It does not appear to enter into the calculation of AB.

From C draw a line parallel to AB to cut BD at F.

So FC = AB since we now have a rectangle where

angle DFC = 90°

by Pythagoras,

FC^2 + 5^2 = 13^2

FC = 12

so AB = 12

**Related Questions**

Geometry - A dartboard consists of five concentric circles. The radius of the ...

GEOMETRY CIRCLES PLEASE - 1.An isosceles triangle with each leg measuring 13 cm ...

maths - there are two circles touching each other at one point. The radius of ...

math - From an exteror point P that is h units form a circle of radius r, a ...

GEOMETRY CIRCLE - 1.An isosceles triangle with each leg measuring 13 cm is ...

GEOMETRY CIRCLES PLEASE - HELP ME PLEASE. 1.An isosceles triangle with each leg...

Math - From an exterior point P that is h units from a circle of radius r, a ...

Graphing Circles - Finding the radius - A circle is tangent to the y-axis at ...

MATH HOMEWORK - Find the circle circumference and circle area with a circles ...

Pre-Calc (Circles) - Describe the conditions necessary, where circle A has a ...