Since we know the lengths of both legs in the right triangle, it is easier to compute {{MATH_164}} than {{MATH_165}}. Recall the trig identity: {{MATH_166}}. {{ENV_167}} Now we {{CMD_168}}solve{{CMD_169}} for the unknown rate, when {{MATH_170}}, {{ENV_171}} So, when {{MATH_172}}, the angle is changing at {{MATH_173}} radians per second. {{CMD_174}} {{CMD_175}}