For 11:
The smaller side of the smaller rectangle is 2 on the larger is 12 so 12 divided by 2 is six
The side for the smaller one is 5 so five times 6 is 30…
The answer for X is 30
For 12:
16 divided by four is four
The other side is six so for the bigger Triangle decide would be 6×4 which is 24
X is 24