Angles a and b are supplementary angles. What is the value of mLa if mLb = 43°? (1 point)
The value of mLa would be 137°.
Supplementary angles are two angles that add up to 180°. So, if mLb is 43°, the measure of angle a can be found by subtracting 43° from 180°:
mLa = 180° - 43°
mLa = 137°