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Area

Area of kites of rhombuses

 A kite, or deltoid, is a quadrilateral with two disjoint pairs of congruent adjacent sides, in contrast to a parallelogram, where the sides of equal length are opposite.

A Rhombus is a four-sided polygon having all four sides of equal length and whose opposite sides are parallel (every rhombus is a kite).

Each rhombus has two diagonals. The biggest one is called long diagonal and the smaller one is called short diagonal. (Note that the diagonals of a rhombus are perpendicular).

Area of kites and rhombuses

 The area of any kite or rhombus is equal to one-half the product of the lengths D and d of its diagonals. $Area=\frac{D\;\cdot\;d}{2}\;$

Find the area in cm2

 $Area=\frac{D\;\cdot\;d}{2}\;$ $Area=\frac{12\;\cdot\;10}{2}\;$ A=60 cm2

What is the area when D=20 and d=2?

Solution: