Parallelogram ABCD is a rectangle. If AB = 12.5 units and AD = 2.5 units, what is the area of ABCD? A. 15 square units
B. 30 square units
C. 10 square units
D. 31.25 square units

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