I suggest Math.Com
Lots of papers so you can draw it out and "see" it better
Construction tools as suggested
A Very fine point pencil
Patience
Perserverence
A good sense of fun and sticktoitiveness!
Jason

In radians 36 degrees is pi/5.
If you look at a table of so called "special angles" in a textbook
you should notice that the exact values of angles pi/2, pi/3, pi/4,
pi/6 (90, 60, 45, and 30 degrees) are listed but not pi/5. So now you have it.

cos(pi/5)=phi/2=(1+sqrt.5)/4
which is also equal to sin(3*pi/10), the complimentary angle. (3*pi/10 = 54 degrees)

And with Pythagorean theorem you can find the sin(pi/5) which
also equals cos(3*pi/10)

Trig textbooks also illustrate "special triangles" ; right triangles with the angles listed in that table.
The 45-45-90 triangle, and the 30-60-90 triangle.
So now we have another useful special triangle-
36-54-90.

But calculating the sin and cos of the angles is a bit more difficult for beginner trig students.
It requires understanding pentagons and the golden ratio.