Question

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Answer 1

is \(r=4.5\) ?

Answer 2

OH yes! it is!

Answer 3

did you go about it with pythagoras?
thats how i was trying it...

Answer 4

This is a simple problem if you figure out a correct start

Answer 5

i made myself isoscles triangles with radii as to sides of each triangle...

Answer 6

I did the same, try finding the area in two different ways, set them equal and solve \(r\)

Answer 7

OH i see, thats clever!

Answer 8

thanks so much!

Answer 9

np
http://www.wolframalpha.com/input/?i=solve+%282r%2B7%29%2F2*sqrt%28r%5E2-3.5%5E2%29+%3D+1%2F2*7*sqrt%28r%5E2-3.5%5E2%29+%2B+2*1%2F2*3*sqrt%28r%5E2-1.5%5E2%29%2Cr%3E3.5