Availability, in the context of a computer system, refers to the ability of a user to access information or resources in a specified location and in the correct format.
Defined, the triangle proportionality theorem states that if you draw a line parallel to one of the sides of a triangle that also crosses the other two sides, then that line will divide the two sides in a proportional way.
SAS Similarity Theorem. This theorem states that if an angle of one triangle is congruent to an angle of another triangle and the sides including though angles are in proportion, then the triangles are similar.