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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Answer
Step 1: Define the unknown angles. Let the smaller angle be . Let the larger angle be .
Step 2: Formulate equations based on the problem statement. The problem states that the larger angle is four times bigger than the smaller angle: The diagram shows two angles on a straight line, which means they are supplementary. Their sum is :
Step 3: Substitute the first equation into the second equation. Substitute into :
Step 4: Solve for . Combine like terms: Divide by 5:
Step 5: Solve for . Use the relationship :
The two unknown angles are and .
The smaller angle is . The larger angle is .
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Define the unknown angles. Let the smaller angle be x.
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.