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.
Base Angle Theorem states that if two sides in a triangle are congruent, then the angles opposite to these sides are also congruent. Base angles of an isosceles triangle are equal.