How to learn trigonometry<br>Define the parts of a triangle. At its core, trigonometry is the study of relationships present in triangles. A triangle has three sides and three angles.
Learning trig begins with learning triangles 
The first step was knowing the parts of a triangle 
( z1 begin :ARG1 ( z2 learn :ARG1 ( z3 trig ) ) :ARG2 ( z4 learn :ARG1 ( z5 triangles ) ) )