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Table of Contents

- Why is it called an isosceles trapezoid?
- What defines an isosceles trapezoid?
- How do you know if a trapezoid is isosceles?
- What makes a trapezoid an isosceles trapezoid?
- What is the difference between an isosceles trapezoid and a trapezoid?
- Is a trapezoid always isosceles?
- What is the Midsegment formula for a trapezoid?
- Does a trapezoid have 2 equal sides?
- Does an isosceles trapezoid have a right angle?
- What is a 7 sided object called?
- What is unique about the isosceles trapezoid?
- Are 2 isosceles trapezoids always similar?
- Are all isosceles triangles equilateral?
- Are all isosceles triangles with two 50 angles congruent explain?
- What is the measurement of an isosceles trapezoid?
- How do you find the diagonals of an isosceles trapezoid?
- Is an isosceles trapezoid congruent?
- Is an isosceles trapezoid a kite?
- Is a rectangle also a trapezoid?

There are special relationships in trapezoids, particularly in isosceles trapezoids. The word “isosceles” means “equal legs.” Isosceles trapezoids have non-parallel sides that are of the same lengths. These equal sides are sometimes called the “legs.”

An isosceles trapezoid (called an isosceles trapezium by the British; Bronshtein and Semendyayev 1997, p. 174) is trapezoid in which the base angles are equal and therefore the left and right side lengths are also equal.

Properties of the sides of an isosceles trapezoid:

- The bases (top and bottom) of an isosceles trapezoid are parallel.
- Opposite sides of an isosceles trapezoid are the same length (congruent).
- The angles on either side of the bases are the same size/measure (congruent).
- The diagonals (not show here) are congruent.

A trapezoid is a quadrilateral with exactly one pair of parallel sides. 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.

Overview. A trapezoid is a quadrilateral where one pair of sides is parallel while the other two sides are not. In an isosceles trapezoid the non-parallel sides are congruent.

An isosceles trapezoid is a trapezoid where the non-parallel sides are congruent. Theorem: The base angles of an isosceles trapezoid are congruent. The converse is also true: If a trapezoid has congruent base angles, then it is an isosceles trapezoid.

The midsegment of a trapezoid is parallel to each base, and its length is one-half the sum of the lengths of the bases. If MN is the midsegment of trapezoid ABCD, then MN||AB and MN||DC and MN = 2(AB+CD).

An isosceles trapezoid is a trapezoid where the base angles have the same measure. As a consequence the two legs are also of equal length and it has reflection symmetry. This is possible for acute trapezoids or right trapezoids (rectangles). A parallelogram is a trapezoid with two pairs of parallel sides.

The base angles of an isosceles trapezoid are equal in measure (there are in fact two pairs of equal base angles, where one base angle is the supplementary angle of a base angle at the other base)….

Isosceles trapezoid | |
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Properties | convex, cyclic |

heptagon

One way to prove that a quadrilateral is an isosceles trapezoid is to show:

- The quadrilateral has two parallel sides.
- The lower base angles are congruent and the upper base angles are congruent.

An isosceles trapezoid has the following unique properties: One pair of parallel sides. Base angles are congruent. The legs are congruent.

Since a triangle is isosceles if and only if two of its angles are congruent, if a triangle is similar to an isosceles triangle, then it will also have two congruent angles and must be isosceles. Second, “If △ABC and △DEF are isosceles, then they are similar.” This is not true.

An equilateral triangle is one with three equal sides. An isosceles triangle is one with two equal sides. Therefore, every equilateral triangle is isosceles, but not every isosceles triangle is equilateral.

Explanation: If a triangle is isosceles, two of the angles must be congruent. So the angle must be either 50 degrees or 80 degrees. The only answer choice that is both the same as one of the given angles and results in a sum equal to 180 degrees is the 50 degree angle.

Univ. An isosceles trapezoid has two congruent legs and one pair of parallel sides. The base angles are congruent to one another, and by same side interior angles, the upper angles are supplementary to the respective base angles, meaning that they are both 180° – (the measure of the base angle).

Assume the figure is an isoceles trapezoid. Adding these two values together, we get . The formula for the length of diagonal uses the Pythagoreon Theorem: /displaystyle AC^2 = AE^2 + EC^2, where is the point between and representing the base of the triangle.

A trapezoid is a quadrilateral with exactly one pair of parallel sides. Now, if a trapezoid is isosceles, then the legs are congruent, and each pair of base angles are congruent. In other words, the lower base angles are congruent, and the upper base angles are also congruent.

THEOREM: (converse) If a trapezoid has its opposite angles supplementary, it is an isosceles trapezoid. A kite is a quadrilateral whose four sides are drawn such that there are two distinct sets of adjacent, congruent sides.

Some define a trapezoid as a quadrilateral having only one pair of parallel sides (the exclusive definition), thereby excluding parallelograms. Under the inclusive definition, all parallelograms (including rhombuses, rectangles and squares) are trapezoids.