- Use the calculator on the right to calculate height, base lengths and area of a trapezoid. Enter any three values and the missing one will be calculated.http://www.mathopenref.com/trapezoidarea.html
### Area of a Trapezoid - Math Goodies

Summary: To find the area of a trapezoid, take the sum of its bases, multiply the sum by the height of the trapezoid, and then divide the result by 2, The formula for ...http://www.mathgoodies.com/lessons/vol1/area_trapezoid.html### Finding Area and Perimeter of a Parallelogram - What's the ...

Transcript: What's the Formula for Finding Area and Perimeter of a Parallelogram? Hi, I'm Maria Birch and in this video, I'm going to show you how to find the area ...http://video.about.com/math/What-s-the-Formula-for-Finding-Area-and-Perimeter-of-a-Parallelogram-.htm### Area of a rectangle. Definition and formula - Math Open ...

The number of square units it takes to completely fill a rectangle. Formula: Width × Heighthttp://www.mathopenref.com/rectanglearea.html### Area of a Trapezoid - Web Formulas

A trapezoid is a quadrilateral that has only one pair of sides that are parallel. To calculate the area of trapezoids, take the average of bases and multiply by its ...http://www.web-formulas.com/Math_Formulas/Geometry_Area_of_Trapezoid.aspx### Area and Surface Formulas - About.com Mathematics

Shapes: Formula. Rectangle: Area = Length X Width A = lw Perimeter = 2 X Lengths + 2 X Widths P = 2l + 2w: Parallelogram Area = Base X Height a = bh: Trianglehttp://math.about.com/library/blmeasurement.htm### Polygons - Area of polygons and circles - In Depth

Area is always a positive number. It represents the number of square units needed to cover a shape, such as a polygon or a circle.http://www.math.com/school/subject3/lessons/S3U2L4DP.html### Formula Area of Cylinder. Explained with pictures and ...

The picture below illustrates how the formula for the area of a cylinder is simply the sum of the areas of the top and bottom circles plus the area of a rectangle.http://www.mathwarehouse.com/solid-geometry/cylinder/formula-area-of-cylinder.php### Formula for Area of a Triangle - LOIS TERMS

Lois explains the formula for area of a triangle. ... Go Backhttp://www.loisterms.com/form8.htm### Surface Area and Perimeter of a Parallelogram

Surface Area and Perimeter of a Parallelogram. Formula for parallelogram.http://math.about.com/od/formulas/ss/areaperimeter_4.htm### Cool math .com - Areas of Geometric Shapes - Circles ...

The area of a parallelogram: To find the area of a parallelogram, just multiply the base length (b) times the height (h):http://www.coolmath.com/reference/areas.html### Areas, Volumes, Surface Areas - Math2.org

(pi = = 3.141592...) Areas. square = a 2. rectangle = ab . parallelogram = bh . trapezoid = h/2 (b 1 + b 2) circle = pi r 2. ellipse = pi r 1 r 2. triangle = (1/2) b hhttp://math2.org/math/geometry/areasvols.htm### Area of Circle, Triangle, Square, Rectangle, Parallelogram ...

Example: What is the area of this triangle? Height = h = 12. Base = b = 20. Area = ½ × b × h = ½ × 20 × 12 = 120http://www.mathsisfun.com/area.html

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