1.

Find the angles a,b,c​

Answer»

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



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