Posted by **bob** on Thursday, December 8, 2011 at 10:27pm.

each of three circles touches the other 2.circle A has a radius of 8 cm. circle B has a radius of 4 cm.circle C has a radius of 1 cm.a triangle is formed by connecting the centers of the 3 triangles. determine the largest angle for the triangle and in which circle is the largest angle?

- pre calc -
**Steve**, Friday, December 9, 2011 at 10:58am
Draw a diagram. The sides of the triangle are 12,9,5

The angle at C subtends the longest side, so it will be the largest angle.

by the law of cosines,

12^2 = 9^2 + 5^2 - 2*9*5 cosC

144 = 81 + 25 - 90 cosC

cosC = -38/90

C = 115°

## Answer this Question

## Related Questions

- pre calc - EAch of 3 circles touch the other 2. Circle A=radius 8cm Circle B=...
- Pre-Calc (Circles). Please help :( - Five concentric circles with radii 1, 2, 3...
- Pre-Calc - Describe the conditions necessary for the two circles, where circle a...
- Pre-Calc (Circles) - Describe the conditions necessary, where circle A has a ...
- GEOMETRY CIRCLES PLEASE - 1.An isosceles triangle with each leg measuring 13 cm ...
- 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...
- PLEASE HELP TANGENTS AND CIRCLES PROBLEM GEOMETRY - PLEASE HELP I REALLY NEED ...
- maths - there are two circles touching each other at one point. The radius of ...
- Math - Circle C has radius 4 inches. Circle D had radius 9 inches. These two ...