The boy on the tower of height h = 16 m in the figure below throws a ball a distance of x = 64 m, as shown. at what speed, in m/s, is the ball thrown?

So if the time to hit the ground is
y=1/2*g*t^2 (projectile formula)

then
t=sqrt(2*y/g) = sqrt(2*16/9.8) = 3.26s

so then
64m/3.26s = 19.63m/s

You have 2 sides that are 2 cms and you have 6 sides that are 1/2 cm and you have 4 sides that are 1 cm. the smallest sides are 1/2 the medium sized sides are 1 and the smallest are 1/2. so to find the perimeter you have to add them all up together so your answer will be 11 cm's