## At A Glance

### Using Properties of Parallelograms | Geometry How To Help

In this video math lesson on the properties of parallelograms, I discuss several theorems related to parallelograms. Opposite sides of a parallelogram are congruent. Consecutive angles of a parallelogram are supplementary. Opposite angles of a parallelogram are congruent. The diagonals of a parallelogram bisect each other. Parallel lines congruent segments theorem.
Length: 15:55

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Questions about Using Properties of Parallelograms | Geometry How To Help

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• #### if you know the perimeter and the height of the parallelogram, how do you find the length of the sides?

Hello there! Here is a formula to help you find the length of the missing side!

Take the formula and fill in what you know. Then do some simple algebra and find out the solution!

perimeter = 2(w+h)

where ...