thanks

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- Dec 14th 2008, 04:29 AMhelloyingtrapezoid
thanks

- Dec 14th 2008, 07:23 AMearboth
Cut off thetwo right triangles of the trapezium (see attachment)

Then you know

**(A)**........ and ........**(B)**

According to my sketch you can see that

Solve the equations (A) and (B) for h and substitute (8-x) instead of y:

Solve for x. I've got and consequently and

I'll leave the rest for you.