Difference between revisions of "Trapezoid"
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* 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 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. | * The sum of the oblique angles will be equal to the sum of the tangent angles. | ||
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.