Trapezoids: Finding Angles and Segments.

Do you know that when you have an isosceles trapezoid: All acute angles are congruent, all obtuse angles are congruent, and that if you take one acute, and one obtuse at a time they are supplementary?

In this lesson, you will work with isosceles trapezoids. You will view the solution of the problems with an emphasis in highlighting the concepts from previous sections that apply to this type of problems. You will be given a few problems embedded in the lessons to test your understanding. For this atractive alternative throughout the lesson is that you will have the chance to solve those similar problems on the screen with the marker tools menu and your stylus. Venture yourself to a new trapezoid experience!

Lesson's Content

Lesson In PDF Format (no animations)


Lesson's Glossary

Geometry shape formed by two rays (initial and ending sides of the angle) that share a common endpoint called the vertex. You may name an angle using the vertex, or a point in each ray and the vertex label in the center.

Isosceles trapezoid
Trapezoid with two non-congruent and non-parallel sides. 

It is a closed plane figure with a least three straight segments as sides.

A four-sided polygon.

Line segment; A section of a line, defined by two end points and all the points between them.

Quadrilateral with exactly one pair of parallel sides.


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