They don't always. When two lines are crossed by another line (called the transversal) the angles in matching corners are called corresponding angles. If the two lines being crossed are parallel lines, then (and only then) the corresponding angles are equal.
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Yes they always do have the same degree of measurements
True
Yes. Corresponding angles of the two triangles are always equal, and lengths of corresponding sides are always in the same ratio.
An equilaterial triangle is always similar, because the corresponding angles are conqruent, it has the same basic shape, and it has a scale factor.
corresponding means that they are at the same position, and congruent means that they are the same size and shape