How to Determine the Area of a Trapezoid

A trapezoid is a four-sided figure with one pair of parallel sides. Because a trapezoid can be dissected into a rectangle and two identical triangles, find it’s area is easy.

You will need

  • The dimensions of the trapezoid
  • A calculator

Step 1 Sum the length of the two parallel sides Add the lengths of the two parallel sides of the trapezoid.

Step 2 Multiply by the height Find the height of the trapezoid. Using a calculator, multiply the sum of the lengths by the height.

Step 3 Divide by two Divide the product by two. This is the area of the trapezoid.

Step 4 Look for similar examples Be on the lookout for other polygons whose areas can be determined more easily if the polygons are composed of simpler shapes.