A trapezoid is a quadrilateral with one set of parallel sides. The area of a trapezoid is one-half the sum of the lengths of the parallel sides multiplied by the height. In this diagram, that becomes ½(b + d)(h).

The dimensions of this trapezoid are a = 4, b = 7, c = 5, d = 3, and h = 3. What is the area?

7\(\frac{1}{2}\) | |

13\(\frac{1}{2}\) | |

15 | |

28 |