Parallelogram Calculator & Solver
Easy to use online calculators to calculate the area (Ar), sides, diagonals, height, and angles of a parallelogram. These online calculators use the formulas and properties listed below.
Key formulas:
\[ Ar = b \times h = a \times b\sin(A) = a \times b\sin(B) \]
\[ h = a\sin(B) \]
\[ AC^2 = a^2 + b^2 - 2ab\cos(B) \]
\[ BD^2 = a^2 + b^2 - 2ab\cos(A) = a^2 + b^2 + 2ab\cos(B) \]
\[ \angle A = \angle C,\qquad \angle B = \angle D,\qquad \angle A + \angle B = 180^\circ \]
More References and Links
