pre calc
posted by jim on .
EAch of 3 circles touch the other 2.
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!=[

Wouldn'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(sa)sb)(sc), were a,b, c are the sides and
s = (1/2)perimeter.
s = (12+9+5)/2 = 13
sa = 1312 = 1
sb = 138 = 5
sc = 135 = 8
area = √(13x1x5x8) = √520 = appr. 22.8 cm^2