How to find the area of a trapezoid

How to find the area of a trapezoid

Common Core Standard   7.G.6

Area of a Trapezoid

A trapezoid is a four sided polygon with one pair of parallel sides.
 
Area is a measure of the number of square units found inside the trapezoid. Area is a two dimensional measure so it is always squared.
 
The height of the trapezoid is perpendicular to the two parallel bases. One common mistake made when calculating the area of a trapezoid is to use the side length as the height. Again, the height is measured as a line perpendicular to the two parallel bases.
 
trapezoid
The video below covers several of the properties of a trapezoid.
 
The area of a trapezoid may be found using the formula 1/2h(b1+b2)
 
Video answers these questions
Why use the formula 1/2h(b1+b2) to find the area of a trapezoid?
 
What is the area of a trapezoid with a height of 10 units, and sides of 12 and 16 units?
 
What is the area of a trapezoid with sides of 4,5, and 9 units?
In order to solve this triangle you have to find the height of the trapezoid.