Answer:
36
Step-by-step explanation:
12 times 6 is 72
72 divided by 2 is 36
so this half of the side is 36
lets name the missing length x
x = 12×12 + 6×6
x=144+36
x=180 find the square root of 180
x=13.42
to the nearest tenth which is 13. 40
