Difference between revisions of "Trapezoid"
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(perimeter and angles) |
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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 of the trapezium is the average of the parallel sides multiplied by the distance between them. | + | * The area of the trapezium is the average of the parallel sides multiplied by the distance between them. |
| + | * The perimeter is equal to the sum of the oblique sides times the sum of the tangent sides | ||
| + | * The sum of the oblique angles will be equal to the sum of the tangent angles. | ||
[[Category:Geometry]] | [[Category:Geometry]] | ||
Revision as of 18:54, August 23, 2007
A trapezoid (British: trapezium) 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 of the trapezium is the average of the parallel sides multiplied by the distance between them.
- The perimeter is equal to the sum of the oblique sides times the sum of the tangent sides
- The sum of the oblique angles will be equal to the sum of the tangent angles.