Not only. They can be formed by the legs.
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The base angels of a trapezoid are the angles that attach to the legs of the trapezoid. There are four base angles in a trapezoid.
No angle is defined, only that two sides are the same length. Also, the two base angles are congruent.
It has 3 interior angles and its base angles are equal in size
In an isosceles triangle that has exactly two equal sides, the equal sides are called legs and the third side is called the base. The angle included by the legs is called the vertex angle and the angles that have the base as one of their sides are called the base angles.
Two equal lengths and two equal angles.