Question 1031191
That would be a mighty tiny house!  
All the other information except the length and width is superfluous.  If her townhouse is 12 x 10, then the area = 12cm * 10cm = 120 square cm.
The perimeter is the fence around her house.  Twice the length + twice the width.  12 + 12 + 10 + 10 = 44 cm.