Change  to an improper fraction:



Since  we draw a right
triangle with an angle  with a hypotenuse of 5, which is 
the same as the numerator of the fraction , and with 
a side opposite angle  of 2, which is the denominator
of the fraction .



[You don't have to be accurate with your drawing, just any sketch of
a right triangle will do.]

Next we use the Pythagorean theorem to calculate the adjacent side
to angle :











So we label the adjacent side as 













Edwin