In given figure, find measure of ∠B’A’C’
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both triangles are congruent triangles,
then
3x=2x+20
3x-2x=20
x=20
angle A =3x= 3 x 20= 60
angle A'= 2x +20= 2 x 20+20=60
now., sum of angles of a triangle = 180
angle A +angle B +angle C = 180
60+60+ angle c= 180
120 + angle c = 180
angle c =180-120= 60
so angle C' also 60
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