Shapes

1234
Across
  1. 1. I am very colourful but to succeed you have to make me of one of my faces in one single colour.
  2. 4. I have 3 faces,2 edges and 0 corners. I am used in kitchen to cook.
Down
  1. 2. I am found in our flag. I have no edges or corners. What kind of shape am I?
  2. 3. I come in a square box, I am round when opened and triangle when sliced.
  3. 4. I have only 2 faces. When I am placed along my curved face, I roll and when I am placed along my plane face I slide. Who am I?