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If the two segments form an angle it would be obvious that the included angle would be angle a since it is present in both line segments
The SAS Postulate states if two sides and the included angle of a triangle are congruent to two sides and the included angle of another triangle, then the two triangles are congruent.
Two sides and the included angle of one triangle must be congruent to two sides and the included angle of the other.
Perpendicular would be at a right angle. If your sides are abcd, then ab, bc, cd, and da are perpendicular pairs.
angle BLD is 72 degrees.