To find the missing angle in a triangle when you know two angles, you can use the property that the sum of all angles in a triangle is always 180 degrees.
Let’s denote the three angles as:
- Angle A = 15°
- Angle B = 85°
- Angle C = ? (the missing angle)
We can express this relationship mathematically as follows:
\[ A + B + C = 180° \]
Substituting the known values into the equation:
\[ 15° + 85° + C = 180° \]
Now, combine the known angles:
\[ 100° + C = 180° \]
Next, isolate \(C\) by subtracting 100° from both sides:
\[ C = 180° - 100° \]
Calculating this gives:
\[ C = 80° \]
Therefore, the missing angle is \(80°\).
Final Answer: 80°
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