I've attached a sketch of the cone of the hat.

You already know:

c = 50 cm therefore

For the brim you need a circle with the radius

h = 60 cm therefore the length of the slanted line is

The circumference of the head is c = 50 cm. The angle of the sector which is used to make the curved surface of the cone is

The total surface area is

With all those formulae you can do (most of) the questions.

If you need additional informations, please ask again.