4/10 is 2/5 or 0.4 in decimal form.
11 units long. When something is rotated it does not change its shape/length, only when it is dilated.
When you simplify 3/12, it's 1/4.
h/8 is equal to 1/4 so you want to multiply 2 for 1/4 which it becomes 2/8
Therefore h is 2