6.6. Trapezoids http://www.ck12.org
6.6 Trapezoids
Here you’ll learn the properties of trapezoids and how to apply them.
What if you were told that the polygon ABCD is an isosceles trapezoid and that one of its base angles measures 38◦
? What can you conclude about its other angles? After completing this Concept, you’ll be able to find the value of a
trapezoid’s unknown angles and sides given your knowledge of the properties of trapezoids.
Watch This
MEDIA
Click image to the left for use the URL below.
URL: http://www.ck12.org/flx/render/embeddedobject/52578CK-12 Foundation: Chapter6TrapezoidsA
Learn more about trapezoid properties by watching the video at this link.
Guidance
Atrapezoidis a quadrilateral with exactly one pair of parallel sides. Examples look like:
Anisosceles trapezoidis a trapezoid where the non-parallel sides are congruent. The third trapezoid above is an
example of an isosceles trapezoid. Think of it as an isosceles triangle with the top cut off. Isosceles trapezoids also
have parts that are labeled much like an isosceles triangle. Both parallel sides are called bases.