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September 21, 2014

September 21, 2014

Posted by **Rmz** on Friday, January 22, 2010 at 3:13pm.

bisect each other at the point where they cross. What generalization about

parallelograms ensures that the ironing board will

always be parallel to the floor, regardless of the height

of the board above the floor?

- Geometry -
**Damon**, Friday, January 22, 2010 at 4:38pmLook at the isoceles triangle at the top and at the bottom. The central angle is the same for each (opposite angles) and the legs are equal so the triangles are congruent. Therefore the angles where each leg meets the floor and the deck are congruent. Equal opposite interior angles ---> parallel.

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