Jaylah Berry
Jaylah Berry voted up Ray Dart's answer

I stole most of this from the web.

From Pythagoras:

AE^2 + DE^2 = r^2

r^2 = (x+4)^2 ..............................(1)

r^2 = (12-x)^2+36

therefore

(x+4)^2 = (12-x)^2+36

simplify and calculate

x= 5

therefore

r = sqrt(9^2 + 4)        (from (1))

= sqrt(85)

Cool solution huh?

Jaylah Berry
Jaylah Berry voted up Dark Majinn's answer

Some interesting answers to an interesting question.

"which came first, the chicken or (just any old) egg?  This                    question is answered “the egg” because species that lay eggs have been around a lot longer than modern chickens. For example, we have plenty of fossil evidence that dinosaurs laid eggs from whichRead more

Jaylah Berry
Jaylah Berry voted up Dark Majinn's answer

Some interesting answers to an interesting question.

"which came first, the chicken or (just any old) egg?  This                    question is answered “the egg” because species that lay eggs have been around a lot longer than modern chickens. For example, we have plenty of fossil evidence that dinosaurs laid eggs from whichRead more