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February 27, 2015

February 27, 2015

Posted by **John** on Wednesday, March 6, 2013 at 11:59pm.

- Geometry -
**Steve**, Thursday, March 7, 2013 at 10:51amFrom the secant-secant rule,

FB*21 = 6*39, so FB=78/7

AD+DE+EB = 3+39+6 = 48

CG+21+FB = 48, so CG = 111/7

CH*HI = CG*CF = 111/7 * 258/7 = 28638/49

AI*HI = 3*39 = 117

AI+IH+HC = 48

117/HI + HI + 28638/49HI = 48

now "just" solve for HI

The fractions look nasty, so you better check my arithmetic.

- Geometry -
**Steve**, Thursday, March 7, 2013 at 11:01amOops. I was multiplying the wrong segments:

FB(FB+21) = 6*45

FB = 9

FB+FG+CG=48 so CG = 18

CH*(CH+HI) = 18*39 = 702

AI*(AI+HI) = 3*42 = 126

AI+HI+CH = 48

Things look better now

- Geometry -
**Abcd**, Thursday, March 7, 2013 at 12:05pmYes, solving gives HI^2= 792.

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