Given mo is perpendicular to np and no is congruent to po prove mn is congruent to mp

Lets imagine the shape 
M
  /\
  / | \
  / | \
  / | \
  P /___ |___\ N
  O
 Now in If we take â†MOP and â†MON
 As MO ⊥ NP so â MON=â MOP
 NO=NP (given)
 And MO is a common side 
 so by side angle side rule of congruency 
 â†MOP and â†MON are congruent
 so MP is congruent to MN