Answer:
a = 50° , b = 130° , c = 130°
Explanation:
the sum of the angles in a triangle is 180°
sum the angles in Δ PQT and equate to 180°
a + 50° + 80° = 180°
a + 130° = 180° ( subtract 130° from both sides )
a = 50°
the exterior angle of a triangle is equal to the sum of the opposite two interior angles
b is an exterior angle of Δ PQT , then
b = 80° + 50° = 130°
c is an exterior angle of Δ PQT , then
c = 80° + a = 80° + 50° = 130°