This mathematics problem involves applying core mathematical principles and formulas. Below you will find a complete step-by-step solution with detailed explanations for each step, helping you understand not just the answer but the method behind it.

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Here's how to find the size of the third angle in each triangle:
The sum of the angles in any triangle is .
a) For the first triangle:
Step 1: Add the two given angles.
Step 2: Subtract this sum from to find the third angle, . The third angle is .
b) For the second triangle:
Step 1: Add the two given angles. Note that the square symbol indicates a right angle, which is .
Step 2: Subtract this sum from to find the third angle, . The third angle is .
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Here's how to find the size of the third angle in each triangle: The sum of the angles in any triangle is 180^.
This mathematics problem involves applying core mathematical principles and formulas. Below you will find a complete step-by-step solution with detailed explanations for each step, helping you understand not just the answer but the method behind it.