# The diagonals of a parallelogram

Calculator computes the diagonals of a parallelogram and adjancent angles from side lengths and angle.

### This page exists due to the efforts of the following people:

**Author**- Timur - The diagonals of a parallelogram
**Created using the work of**- Timur - The polygon diagonals of a parallelogram

This calculator computes the diagonals of a parallelogram and adjancent angles from side lengths and angle between sides.

It is done with the help of law of cosines

Check the picture. First, we use law of cosines to find out d1, then we find second angle of parallelogram, which is , then we again use law of cosines to find out d2. Remaining angles are found from the same law of cosines. After that we find diagonal intersection angles using the fact that sum of triangle angles is 180.

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Diagonal d1

Diagonal d2

Second parallelogram angle

Angle between d1 and d2

Angle between a and d1

Angle between b and d1

Angle between a and d2

Angle between b and d2

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