How many non-orthogonal triangles can be formed with perimeter 15 cm.
a) 9
b) 10
c) 12
d) 21

• correction it was non congruent.
• 9 years agoHelpfull: Yes(0) No(0)
• anssss?????????
  
• 9 years agoHelpfull: Yes(0) No(1)
• 6,6,3 = 3!/2!= 3
  6,5,4 = 3! = 6
  5,5,5 =3!/3! = 1
  total non orthogonal triangles = 3+6+1 = 10
• 8 years agoHelpfull: Yes(0) No(1)