This week I have learned how to find an angle in a triangle using 2 sides. First you must label the triangle and figure out wether to use tan, cos, or sin. For this question you use cos, you also have two sides (19 an 10) to find angle B I used the formula cos(b)10/19 you then change it to cos^-1(10/19) which equals 58 so angle B is 58 degrees.