The missing angle is 93°.
To solve for b, we can use the fact that the sum of the angles in a triangle is 180 degrees.
Given that one angle is 21.5 degrees and another angle is 65.5 degrees, we can set up the following equation:
21.5° + b + 65.5° = 180°
Combining like terms, we get:
b + 87° = 180°
Subtracting 87° from both sides, we have:
b = 93°
Therefore, the missing angle is 93°.