This is a sine law problem. I would check to see if it is going to work. Draw a perpendicular from the unmarked third angle to the base of the triangle. You are finding the height of the triangle. 2.8 must be greater than this height or the triangle has no solution.
Sin(20) = h/5.1 Multiply both sides by 5.1
5.1 * sin(20) = h
5.1 * 0.3420 = h
h = 1.744
Conclusion
Since 2.8 > 1.744 we do have a triangle [It was possible that we did not]7
Equation
Sin(x) / 5.1 = sin(20) / 2.8 Multiply both sides by 5.1
let's recall that a circle has a total of 360°, so a circular clock has 60 minutes, and if we divide those 360° into 60 even intervals, that'd be 360/60 or 6° per minute.
so since 1 minute is 6°, then 23 minutes is just 23 * 6 degrees.
