Not only. They can be formed by the legs.
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.
The answer will depend on what information you do have: one of the base angles, the base and one of the legs, the base and one of the base angles. There are also other possible combinations involving medians, etc.
The base angles of an isosceles triangle are the two angles with the same measure, each formed by the intersection between the base of the triangle and one of the two legs.
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.
If the trapezoid is an isosceles trapezoid, with congruent legs, then the base angles are congruent. Otherwise, no.
It has 3 interior angles and its base angles are equal in size
They would probably be the two pairs of angles in the parallelogram or kite base of a quadrilateral based.
An isosceles triangle has three interior angles whose base angles are equal.
Equal angles and equal lengths
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.
The answer will depend on what information you do have: one of the base angles, the base and one of the legs, the base and one of the base angles. There are also other possible combinations involving medians, etc.
I assume you're talking about the angles that make up the letters. In which case - yes, you're right. If you're not sure where they all are... The five right angles are formed on the letters L & E, the acute angles are formed on the V's and the triangle of the A and the obtuse angles are formed by the 'legs' of the A. There are more angles involved but those you mention are present.