110 likes | 123 Views
Section 11-3. Areas of Trapezoids. Theorem 11-5. The area of a trapezoid equals half the product of the height and the sum of the bases. In a trapezoid, the bases are the parallel sides. D. C. A. B.
E N D
Section 11-3 Areas of Trapezoids
Theorem 11-5 • The area of a trapezoid equals half the product of the height and the sum of the bases.
D C A B
An altitude of a trapezoid is any segment perpendicular to the line containing a base from a point on the opposite base.
D C A B
Since the bases are parallel, all altitudes have the same length, called the height of the trapezoid.
D C A B h h h
D C A B E F Median of a trapezoid • The segment containing the midpoints of the legs
*Notice how is used in the area formula! Formula:
Therefore, we can say the area of a trapezoid = median x height Formula: