If two trapeziums of the same height, as shown below, can be joined to form a parallelogram of area 2(a + b), then the height of the parallelogram will be
1
4
2
1
3
1/2
4
2
If two trapeziums of the same height, as shown below, can be joined to form a parallelogram of area 2(a + b), then the height of the parallelogram will be