The Triangle Angle Sum Theorem states that the sum of the three angles in any triangle is always 180°.
Let's call the third angle "x".
According to the theorem, we can write an equation:
63° + 40° + x = 180°
Combining like terms, we have:
103° + x = 180°
To isolate x, we subtract 103° from both sides of the equation:
x = 180° - 103°
x = 77°
Therefore, the measure of the third angle is 77°.
Use the Triangle Angle Sum Theorum to find the measure of the third angle if the first and second angle measure 63° and 40°.
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