First you have to place the compass on the vertex of the angle
The answer is 99.7 percent of chimpanzees
So I have number 1 for you.
She is wrong because 12 is not y2 (second sub) . It is actually supposed to be 4-12 / 7-9.
√3-1
after subtracting one from √3 and dividing two you get √3-1