Answer:
b. 80°
Step-by-step explanation:
The sum of interior angles in a triangle is equal to 180°.
The measure of two of the angles out of three is given, so to find the third angle, we can write the following equation:
60° + 40° + x° = 180°
100° + x° = 180°
x° = 80°
The third angle in the triangle is 80°.
In a triangle, the sum of the angles is always 180 degrees. Therefore, to find the measure of the third angle, we can subtract the sum of the two given angles (40° and 60°) from 180°:
Third angle = 180° - (40° + 60°)
Third angle = 180° - 100°
Third angle = 80°
Therefore, the third angle is 80°, so the correct answer is b. 80°.
