Posted by **Ella** on Wednesday, April 21, 2010 at 7:47pm.

A parallelogram has a 7-inch side and a 9-inch side, and the longer diagonal is 14 inches long. Find the length of the other diagonal. Do you need your calculator to do it?

then, (Continuation) Evaluate 72 + 92 + 72 + 92 − 142 − d2, where d is the length of the shorter diagonal.

- Geometry help -
**PsyDAG**, Thursday, April 22, 2010 at 12:33pm
From your description, you are not dealing with a parallelogram but rather a trapezoid. In a parallelogram, the top is parallel to the bottom, and the two sides are also parallel.

By "d2" do you mean "d squared"? (Online, d^2 = d squared.) Is there supposed to be an equal sign anywhere in your "Continuation"?

Repost your questions in clearer terms.

- Geometry help -
**luke**, Wednesday, April 28, 2010 at 12:50pm
What is the perimeter of a triangle whose sides measure 15cm, 17cm, and 10cm?

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