If a hexagon has a radius (center to point of angle) of 6, what is the side of the hexagon?

If a hexagon has a radius (center to point of angle) of 6, what is the area of the hexagon?

If a hexagon is resting on a flat side, and has a total height of 18, what is the length of each side of the hexagon?

If a hexagon is resting on a flat side, and has a total height of 18, what is the area of the hexagon?

How do I calculate these? Thanks for the potential help.