Difference between revisions of "Trapezoid"
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| − | A '''trapezoid''' | + | A '''trapezoid''' is a four-sided [[polygon]] with two [[parallel]] sides. |
[[Image:trapezoid.gif]] | [[Image:trapezoid.gif]] | ||
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The following properties arise from the definition: | The following properties arise from the definition: | ||
* Two of the pairs of adjacent angles sum to 180<sup>o</sup> | * Two of the pairs of adjacent angles sum to 180<sup>o</sup> | ||
| − | * The area | + | * The area is the mean of the parallel sides multiplied by the distance between them. |
| − | * The perimeter is equal to the sum of the oblique sides | + | * The perimeter is equal to the sum of the oblique sides plus the sum of the tangent sides. |
* The sum of the oblique angles will be equal to the sum of the tangent angles. | * The sum of the oblique angles will be equal to the sum of the tangent angles. | ||
| + | |||
| + | In England, such a shape is called a trapezium.<ref>"Trapezium". ''Britannica Online Dictionary''.</ref> | ||
| + | |||
| + | ==References== | ||
| + | {{Reflist}} | ||
[[Category:Plane Geometry]] | [[Category:Plane Geometry]] | ||
Latest revision as of 06:57, August 22, 2017
A trapezoid is a four-sided polygon with two parallel sides.
The following properties arise from the definition:
- Two of the pairs of adjacent angles sum to 180o
- The area is the mean of the parallel sides multiplied by the distance between them.
- The perimeter is equal to the sum of the oblique sides plus the sum of the tangent sides.
- The sum of the oblique angles will be equal to the sum of the tangent angles.
In England, such a shape is called a trapezium.[1]
References
- ↑ "Trapezium". Britannica Online Dictionary.
