The most difficult mathematics is that which you do not know. A surprising amount of mathematics is actually easy once you've learned it. Of course, once you learn the easy stuff, then you have to start tacking the deep stuff, and that gets harder.
An isosceles triangle has two sides of equal length. An isosceles triangle also has two angles of the same measure; namely, the angles opposite to the two sides of the same length; this fact is the content of the isosceles triangle theorem, which was known by Euclid.
Question:Each of the base angles of an isosceles triangle is 37 degrees and each of the equal sides is 30. Find the perimeter of the isosceles triangle. you cant use sin cos and tan because its not a right triangle, and the third side is different.