Final answer:
To find missing angles in a math problem, you need additional information such as relationships between angles or given values. Then, you can use mathematical methods like trigonometry or shape properties to calculate the missing angles.
Step-by-step explanation:
The question provided does not state the specific missing angles to be found. However, based on the given information, I can explain how to find missing angles using the provided data.
First, it seems that the angles are related to some calculations involving degrees. For example, in the given solution for 53 (d), the angle 20₁ is found to be equal to (2)(14.5°), which is 29°.
To find missing angles in general, you would need more information, such as the relationships between the angles or any given values for certain angles. With that additional information, you could use various mathematical methods, such as trigonometric functions or angle relationships within shapes, to calculate the missing angles.