How to work out the area of a rhombus

In rhombus, there are two diagonals.

Ar. of rhombus= × diagonal 1× diagonal 2

U have to byheart this formula.

in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

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