A circular garden plot has a radius of 6.5 feet. Erykah is putting a metal border around the edge of the garden plot. If Erykah has exactly enough metal border, which measurement is closest to the length of the border in feet?
0 132.67 ft
0 40.82 ft
O 20.41 ft
O 42.25 ft

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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