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**ellipse** = //pi// r1 r2 [[image:http://www.math.com/tables/geometry/ellipse.gif align="baseline"]]
Examples

Square: The area formula of a square is area= a^2. Both side lenghts of the square is 9. To find the area you go (area=9^2) or (area=9 sqared). Therefore the area of a square is 81 square units.

Rectangle: The area formula of a rectangle is area = lw, (length times the width) If your length is 5 and width is 6 To find the area you go (area=5*6) Therefore the area is 30 square units.

Parallelogram: The area formula for parallelogram is area= bh, (base times the height). If your base is 9 and the height is 5. To find the area you go area=(9*5). Therefore the area is 45 sqaure units.

Trapezoid: The area formula for a trapezoid is area= (b1+b2)/2*h, ( base1+base2 divided by 2 times the height). If base1 is 10 and base 2 is 5 and the height is 9. To find the area you go area=(10+5/2*9). Therefore the area is 67.5 square units.

Circle: The area formula for a circle is area=(pi)r^2), (pie)(r squared) If the radius of the circle is 12. To find the area you go area=(pi)(12^2). Therefore the area of a circle is 452.16 square units.

Ellipse The area formula for a circle is (pi)(r1*r2), (pie)(times radius1 times radius2) If radius1 is 5 and radius2 is 10. To find the area you go area=(pi)(5*10). Therefore the area of an ellipse is 157 square units