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(B1 + B2) x Height/ 2

Length x Width

(Base x Height)/2

Add all sides

There are 6 sides and the sum of angles is 720 degrees.

There are 5 sides and the sum of the angles is 540 degrees.

There are 4 sides and the sum of angles is 360 degrees.

There are 3 sides and the sum of all angles is 180 degrees.

Rectangles and rhombuses are special types of parallelogram.

One pair of opposite sides are parallel.