Exercise 8 (1,5 point): On the ray Ox we take points A,B such that : OA= 6 cm; OB=
12 cm.
a) Is Point A the midpoint of segment OB? Why ?
b) Take point M is the midpoint of segment OA. Compute the length of MB
c) Take point N such that BN =4 cm. Compute the length of MN
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