Question

If two angles of a triangle measure 54° and 77° , what is the measure of the third angle​

Answer 1

angle A + angle B + angle C =180°

54°+77°+ angle C =180°

131° + angle C = 180°

•°• Angle C = 180°-131°

= 49°

Answer 2

Answer:

(third angle) angle C=49 degree

Step-by-step explanation:

Let the triangle be ABC. angle A=54degree. angle B=77 degree. angle C=?

Sum of all angles of triangle ABC = 180 degree

angle A+ angle B + angle C=180 degree

54+77+Angle C=180

131+ angle C=180

angle C=180-131

angle C=49degree