The following statement about the rhombus is valid. Formula of parallelogram diagonal in terms of sides and cosine a cosine theorem d1 a2 b2 2abcosa d2 a2 b2 - 2abcosa. The opposite sides of a parallelogram are equal in length.
Area of a parallelogram.
A parallelogram is a quadrilateral with two of its sides parallel. Formula of parallelogram diagonal in terms of two sides and other diagonal. Parallelogram Number of sides 4 Number of vertices 4 Mutually Parallel sides 2 in pair Area Base x Height Perimeter 2 Sum of adjacent sides length Type of polygon Quadrilateral. A parallelogram that has two adjacent equal sides is called a rhombus.