Euclidean geometry equal (SAS), or two angles and a side equal (ASA) (Book I, propositions 4, 8, and 26). Triangles with three equal angles (AAA) are similar, but not necessarily congruent. Also, triangles with two equal sides and an adjacent angle are not necessarily equal or congruent. The sum of the angles of a triangle is equal to a straight angle (180 degrees). This causes an equilateral triangle to have three interior angles of 60 degrees. Also, it causes every triangle to have at least two acute angles and up to one obtuse or right angle. The celebrated Pythagorean theorem (book I,
Cowboys Are Frequently, Secretly Fond of Each Other Cowboys Are Frequently, Secretly Fond of Each Other "Cowboys Are Frequently, Secretly Fond of Each Other" (1981) is a song by Latin country musician Ned Sublette, whose music, according to Howard Cohen, features a "lilting West Texas waltz (3/4 time at about 60–90 beats per minute) feel". It is, according to Gene Tyranny, "the famous gay cowboy song". The lyrics satirize the stereotypes associated with cowboys and gay men, such as in the lyrics relating western wear to the leather subculture with the line: "What did you think all them saddles and boots was about?" Country musician Willie Nelson's cover