Base times height
you just times it by two
yes
The Area of a parallelogram is Area=base times height.
There are an infinite number of parallelograms. No formula is required.
To estimate area enclosed between the x-axis and a curve on a certain bounded region you can use rectangles or parallelograms.
True of False, any to parallelograms with the same side lengths have the same area?
Triangles you use : (base x perpendicular height) divided by 2. Parallelogram: you need to find the area of one of the side triangles, then double it (because there's two of them). Then find the area of the square in the middle, and add this to the area of the two triangles.
A prism is a 3-dimensional figure, which has a volume, so I presume you mean surface area. The simple answer is you find the area of each face (both pentagons and all 5 parallelograms), and then add them together. If you don't know how to find the area of one or more of the faces, that is a separate question.
You cannot. There are infinitely many possible parallelograms whose area is 135 square units, each with a different base (and so a different height).
I think they are the same length because they have equal sides and the area would not change.
No. A rectangle and a parallelograms are desciptions of quadrilateral shapes. There is no indication of the size of either. So some rectangles are smaller than some parallelograms and some parallelograms are smaller than some rectangles.