In triangle XYZ, angle X Z Y is a right angle. The length of Z X is b, the length of Z Y is a, and the length of hypotenuse X Y is c. Then, the side XZ which is the perpendicular, is opposite to ∠Y. Side XZ is adjacent to the ∠Y, and side ZY, which is the base, is also adjacent to ∠Y. We can say that ∠Y has been formed by the sides XZ and ZY.
It is given that,
In triangle X Y Z, angle X Z Y is a right angle or 90°.
The length of the hypotenuse XY is c.
⇒ The side with length c is adjacent to ∠Y.
The sides XZ and ZY form the right angle, thus one is base and the other is perpendicular.
Now, in relation to ∠Y, side ZY of length a is the base (adjacent to angle Y)
Similarly, side XZ of length b forms the perpendicular and is opposite to ∠Y.
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