A diagonal joining opposite angles is the principal diagonal. It may or may not bisect the angles, and that does not affect its name.
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The line is called a diagonal if it is drawn between two nonadjacent angles.
If your are referring to a triangle, then the vertices (angles) are identified using capital letters. So, for example, you can have a triangle ABC.The sides opposite to each angle are labelled in lower case.a is opposite ∠A, b is opposite ∠B, and side c is opposite ∠C
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You can use trigonometry to find the solution. A diagonal divides a square into two triangles, known as "45-45-90" triangles (because of the measures of each angle). According to a law of the same name, the hypotenuse (side opposite of the 90o angle) has a length equal to the length of a leg (side opposite of a 45o angle) times the square root of two. So, since the hypotenuse is a diagonal, you will find that the length of each side of the square is 6 divided by the square root of 2. Find the square of this, and you have the total area: 18 square yards.