may i give a simple n small ans?
here i go......
trigonometry....... break it into 3 words..........
tri.......gono......metry.........
which means
tri= 3
gono=sides
metry=measurement.
the word has been derived from sanskrit meaning tri... kon... mitri...
thus, trigonometry means, dealing with 3 sided figure and measurement related to its angles..........
hope it helps...........