Question

if the measure of an angle are x,(x-20),(x-40) find measure of all angle

Answer 1

x+(x-20)+(x-40)=180 sum of all angles of triangle

3x-60=180

3x=180-60

3x=120

x=120/3

x=40

x=40

x-20= 40-20

=20

x-40=40-40

=0