When the height of a parallelogram is not given, then the area of the parallelogram is calculated using trigonometric ratios.   For example, in the figure shown below,         \\(\ ext{Area of parallelogram (A)} = \ ext{b}\ imes \ ext{h}\\)   \\(\ ext{Area of parallelogram (A)} = \ ext{b}\ imes \ ext{a}\\sin\ heta\\)    As, \\(\ ext{h} = \ ext{a}\ imes \\sin\ heta\\)