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.
A triangle can be located in London.
( z1 possible :ARG1 ( z2 be-located-at :ARG1 ( z3 triangle ) :ARG2 ( z4 city :name ( z5 name :op "London" ) ) ) )