Two sides of a triangle have lengths 12 m and 16 m. The angle between them is increasing at a rate of 2°/min. How fast is the length of the third side increasing when the angle between the sides of fixed length is 60°? (Round your answer to three decimal places.)

X = 30 degrees

100 degrees is a supplementary angle, so you vibrant it from 180 (to get 80) to find the angle next to it in the triangle, then next subtract 80 and 70 from 180 degrees (because a triangle had a total of 180 degrees in it) to get x = 30 degrees.