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March 3, 2015

Posted by **jim** on Thursday, December 8, 2011 at 5:12pm.

Circle A=radius 8cm

Circle B=radius 4cm

Circle c=radius 1cm

A triangle is formed by connecting the centers of the 3 traingles. Determine the largest angle for the traingle and which circle is the largest angle?

Also what is the area?

Please help really stumped!=[

- pre calc -
**Reiny**, Thursday, December 8, 2011 at 5:48pmWouldn't the triangle have sides of 12, 9, and 5 ?

So you given 3 sides,

Use the cosine law I just showed you in your previous post.

For the area use Heron's law

A = √(s(s-a)s-b)(s-c), were a,b, c are the sides and

s = (1/2)perimeter.

s = (12+9+5)/2 = 13

s-a = 13-12 = 1

s-b = 13-8 = 5

s-c = 13-5 = 8

area = √(13x1x5x8) = √520 = appr. 22.8 cm^2

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