Isosceles Trapezoid Conjecture

Explanation:

A trapezoid is a quadrilateral with exactly one pair of parallel sides. In a trapezoid the parallel sides are called bases. A pair of angles that share a base as a common side are called a pair of base angles. A trapezoid with the two non-parallel sides the same length is called an isosceles trapezoid. This conjecture tells us that the base angles of an isosceles trapezoid are equal in measure.

The precise statement of the conjecture is:

Conjecture (Isosceles Trapezoid ): The base angles of an isosceles trapezoid are equal in measure.

Interactive Sketch Pad Demonstration:

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Linked Sketch Pad demonstration of the Isosceles Trapezoid Conjecture

Linked Activity:

Please feel free to try the activity sheet associated with this conjecture.

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Back: Conjectures in Geometry Conjecture List or to the Introduction.