How to calculate the length of digonals in a parallelogram when u have sides?

To calculate the length of the diagonals in a parallelogram when you have the lengths of the sides, you can use the formula:

Diagonal 1 = √(a^2 + b^2 + 2abcos(θ))
Diagonal 2 = √(a^2 + b^2 - 2abcos(θ))

Where:
- a and b are the lengths of the sides of the parallelogram
- θ is the angle between the two sides

You can calculate the angle θ using the formula:

cos(θ) = (a^2 + b^2 - c^2) / 2ab

Once you have calculated the angle θ, you can plug it into the formulas for the diagonals to find their lengths.