Figure (1):12×12 ÷ 2 = 72 (square centimeter);
Figure (2): DE = 14- 12 = 2 (cm),
DF= 122? 22=235 (cm),
12×235÷2= 1235 (square centimeter);
Figure (3): Be = 18- 12 = 6 (cm),
DF= 122? 62=63 (cm),
12×63÷2=363 (square centimeter