Cendrillion

I am having a hard time determining what formula I need to solve the following: On a hexagonal window the height is 1.3m. Find the width.Do I use the pythagreom theorem (but I have only one known number) or do I use the formula 6(1/2as)? I'm confused. The...

A tennis ball can in the shape of a right circular cylinder holds 3 tennis balls snugly. If the radius is 3.5cm, what % of the tennis ball can is occuppied by air? Where do I start?

thank you. I knew the equilateral triangles played a part, but I was confused because only one measurement was given.

I used a visual and calcutated the height as 10.5cm. The radius would be half of the 3.5 to equal 1.75. I used the formul v=pie squared (x) height. I get 101.02 for the volume. I'm not sure what I am supposed to do next. Am I even approaching this the cor...