Trapezoid area uses the average of the two parallel bases multiplied by the height. This works because a trapezoid can be related to a rectangle or paired with another trapezoid.
⚠Bases and height should be nonnegative. Height must be perpendicular to the bases, not a slanted side.
How Trapezoid Area Works
A trapezoid has one pair of parallel sides. Averaging those parallel bases gives an effective width, then multiplying by height gives area.
Parallel Bases
a and b are the two parallel sides.
Height
Height is perpendicular distance.
Average Base
(a+b)/2 gives the mean base length.
Area Units
Area is reported in square units.
💡 Example: For bases 8 and 4 with height 5, A=(8+4)5/2=30.
Applications of Trapezoid Area
Land MeasurementRoof DesignRampsGeometry Homework
Frequently Asked Questions
What is a trapezoid area calculator?▼
It calculates trapezoid area from the two parallel bases and height.
What is the trapezoid area formula?▼
The formula is A=(a+b)h/2, where a and b are the bases.
How do I use this calculator?▼
Enter both bases and the height, then click Calculate.
What does height mean in a trapezoid?▼
Height is the perpendicular distance between the two parallel bases.
Where is trapezoid area used?▼
It is used in land measurement, roofs, ramps, geometry homework, and design.
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