Hopefully you've been given the parallelogram's area.
If so you can use the following formula:
Area of parallelogram = base length x altitude
therefore
altitude = area of parallelogram (divided by) base length
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altitude
The height is the length of its altitude.
height
The formula for area of a parallelogram is bh. Base times height.
The area of a parallelogram is the length of the 'base' times the altitude. In a rectangle, which is a special case of parallelogram, the altitude is maximum length and also is equal in length to the other side.