1. Area of Quadrilaterals
How do I find the area of parallelograms, rhombuses, and trapezoids?

2. Parallelogram
Recall that a rectangle is a special type of parallelogram.
The area A of a parallelogram is the product of its base and height. (like a rectangle) A=bh
Find the area of the parallelogram.
12 in
5.2 in

3. Trapezoids
Two trapezoids put together will form a parallelogram. So this means the area of a trapezoid is ½ the area of a parallelogram.
The height of the parallelogram is the same as the height of the trapezoid. The base is the SUM of the two bases (top and bottom) of the trapezoid.
A=1/2 h(b1+b2) b1 h b2

4. Find the area
Find the area of the trapezoid
17ft
16ft
39ft

5. Rhombus
A rhombus is a quadrilateral where all sides are congruent and opposite sides are parallel.
It can be divided into 4 triangles to create a rectangle.
The base of the rectangle is the same length as one of the diagonals of the rhombus.
The height of the rectangle is ½ the length of the other diagonal.
A=b x h
A=d1 (1/2 d2) h b

6. Rhombus
The formula for the area of a rhombus is half of the product of its two diagonals.
A= ½ d1(d2)
Find the area of this rhombus
15in
24in