Guess my shape!

I have 3 sides and 3 corners. I am a _______________.

I am a quarter of a circle. I am a _______________.

I am half of a circle. I am a _______________.

I have 4 sides and 4 corners. I am a _______________.

I am a closed shape. I have no straight lines. I am a _______________.

You can use 2 triangles to form my shape. I am a _______________.

You can use 2 squares to form my shape. I am a _______________.

I have 5 sides and 5 corners. I am a _______________.

I have 8 sides and 8 corners. I am a _______________.

The next shape in the pattern is a ___________.