Question

find the angles a,b,c​

Answer 1

Step-by-step explanation:

external angle = sum of 2 opposite internal angles

c+55 = 72+a

72+a+b=180

sum of angles in a triangle =180°

c+b+55=180°

angle at a point on straight line =180°

angle a=55

corresponding angles are equal

72+55+b=180°

b= 53

c+55=72+55

c=72