given,

base of rectangle= 12

digonal = 13

therefore,

other side of rectangle would be sqrt[(13^2)-(12^2)] = sqrt(169-144) = sqrt(25) = 5.

so, base of rectangle = 12

other side =5

=> peremeter = 2(12+5) = 2*17 = 34.

and area = 12*5 =60. :)