How do you find the area of a rhombus?

To find the area of a rhombus, divide the rhombus into two equal triangles, calculate the area of one triangle, then multiply by 2. Use a pen, ruler, divider, piece of paper and calculator to complete this task in just a few minutes.

1. Divide the rhombus into triangles

   Draw the fast diagonal to divide the rhombus into two equal triangles. Assign the triangles labels A and B. Draw the second diagonal that passes through the center of the first diagonal.

2. Measure the rhombus

   Stretch the divider, and measure the first diagonal. Transfer the divider to a ruler, and read the measurement. Record it on the piece of paper. This is the base of triangles A and B. Do the same to find the value of the second diagonal. Divide the value of the second diagonal by 2 to get the height of either triangle.

3. Calculate the area of the rhombus

   Using a calculator, multiply the base of triangle A by its height, and divide the product by two to get the area of triangle A. Because triangle A is equal to triangle B, multiply the area of triangle A by 2 to get the area of the rhombus in question.