The Triangle Angle Sum Theorem states that the sum of the angles inside a triangle must equal 180°. Using this theorem, find the measure of angle B.
(1 point)
Responses
25°
25°
335°
335°
80°
80°
45°
80°
Explanation: The sum of the angles inside a triangle must equal 180°. So we can set up an equation:
A + B + C = 180°
A = 45° (given)
C = 55° (given)
So, 45° + B + 55° = 180°
B = 80°