Bonjour qlq peut m'aider svp Soit ABCD un triangle quelconque et soit M un point de [AB] et N un point de [AC] tel que MA=MB=MN=2 cm . Demontrer que ANB est un triangle rectangle en N

solution:

→c= a b , that is product of a and b is possible only when when a is m × n matrix and b is n × p matrix.

that is, number of columns of a= number of rows of b.

so, size of matrix , c= a b is , if a = (m × n)matrix

b= (n × p)matrix

then a b = [ (m × n)matrix] ×[   (n × p)matrix ]

→→c= a b= [m × p ] matrix

→→size of product a b will be equal to = number of rows of a × number of columns of b

96 39 cause 135 -96=39 im smart (i used a calculater)