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Alternatively, since a rhombus is a parallelogram, its area can also be calculated by multiplying its base and height.
Consider a rhombus ABCD and draw its two diagonals. Recall that the diagonals bisect each other at a right angle. Let E be the point of intersection between the diagonals.
AC=d2
Factor out 21d2
DE+BE=d1
Commutative Property of Multiplication