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F
D
140°
120°
C
?
B

Thank you

F D 140° 120° C ? B Thank you-example-1
User Sandhurst
by
6.4k points

1 Answer

6 votes
180°-140°= 40°
120° + 40° = 160°
180° - 160° = 20°
B = 20°
Angles on a straight line add up to 180°
Angles in a triangle add up to 180°
User Minras
by
6.0k points