ABCDEF is ả regular hexagon. Is ABCD an isosceles trapezium? Why?

Prove that any non-isosceles trapezium is not cyclic.

The base of a wooden prism is a regular hexagon. Its base perimeter is 30 cm and height is 5 cm . a) What is the lateral surface area of the prism? b) If it is divided into 6 equal equilateral triangular prisms, what will be the lateral surface area of each triangular prism?