Proposed Problems |
1, 10, 20,
Triangle, Incenter, Excenter. Level: High School, SAT
triangle ABC, the
A and B measure 80 and 40 respectively, I
incenter and E the
excenter. AB and CE meet at D. If BC = a, AC = b and CI = d,
Try a purely geometric proof.
Trigonometry can come in handy quite often, especially when
dealing with angles.
Problem 40 Geometry Help
Using the deductive method, we start
with a few true statements (the axioms) and use them to prove
dozens, hundreds, or thousands, of other statements (the
theorems). Geometry was organized by the Greek mathematician
Euclid, and his deductive method is still used by mathematicians