Answer:
h =81°
Step-by-step explanation:
Since 129° is an exterior angle with respect to the ∆ given,we can apply exterior angle theorem of a triangle:
- Theorem states the exterior angle of a triangle equals the sum of opposite two interior angles.
Mathematically:
- ext < = <a + <b ( <a,<b should be opposite interior to ext < )
Here 129 is exterior angle and the opposite two interior angles are h and (180°-132) = 48°[Since it's a straight line so the sum of angles on it equals 180]
Therefore
Subtract 48° from both sides:
