Cast Diagram. First measure a length of yarn that will give you about 1 for each stitch to be cast on. Is used to help solve trig equations in a given range.
Sine cosine and tangent. There are many ways to cast on. Make a yarn loop leaving about 4 of yarn at the free end.
For example the c in quadrant 4 tells you that c os is positive there.
The other two trig fractions are negative. Sine cosine and tangent. The cast diagram is also called the quadrant rule or the astc diagram. First measure a length of yarn that will give you about 1 for each stitch to be cast on.
