Answer:

Step-by-step explanation:
We can use the Pythagorean theorem to find the length of the diagonal since drawing a diagonal across a rectangle results in two right angle triangles.
Length of diagonal
(The length of the diagonal can be thought of as the hypotenuse of one of the right angle triangles)


∴ The length of the diagonal is 
Hope this helps :)
360/9=40
There are 40 "packs" of 9 students.
40*5=200 for the boys
40*4=160 for the girls
There are 200 boys and 160 girls.