When your ball drops on the floor
The central angle below is 1
I am assuming this is a triangle.....P = a + b + c
P = 2a - 3 + 2a + 3a + 1....combine like terms
P = 7a - 2 <==
Ok so the triangle part is 10 but I don’t know what the rectangle part is but the formula for a rectangle is A=base x high