Posted by **Twg** on Wednesday, August 19, 2009 at 9:13pm.

The legs of an ironing board are equal in length and

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 -
**Ms. Sue**, Wednesday, August 19, 2009 at 9:15pm
What does "parallel" mean?

- GEOMETRY -
**Twg**, Wednesday, August 19, 2009 at 9:52pm
level to doesn't it?

- GEOMETRY -
**Ms. Sue**, Wednesday, August 19, 2009 at 9:57pm
A parallelogram has two sides that are the same distance apart. They are parallel -- like this:

____________________________________

____________________________________

Here's a site about parallelograms.

http://www.ies.co.jp/math/products/geo1/applets/para/para.html

I'm sure you'll be able to answer the question now. Please post your answer, and I'll be glad to check it.

- GEOMETRY -
**Twg**, Wednesday, August 19, 2009 at 10:07pm
ok, is it because the legs are the same size??

- GEOMETRY -
**Ms. Sue**, Wednesday, August 19, 2009 at 10:10pm
Your question is: "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?"

This part of the above site answer the question.

1. The opposite sides are equal in length.

. . .

3. The diagonals bisect each other.

- GEOMETRY -
**Twg**, Wednesday, August 19, 2009 at 10:19pm
so the opposite legs are the same in length even though they cross each other. That's the answer?

- GEOMETRY -
**Ms. Sue**, Wednesday, August 19, 2009 at 10:22pm
The legs are diagonals of the parallelogram, and they bisect each other.

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