Draw the circular sector with the central angle of 90 degrees and a radius of 40cm.

Use compass or a pencil tired to a string (in that case it would be helpful to tape the string to the pivot point). Cut it out and make a cone and don’t forget that a princess cone hat usually has a trailing streamers at the tip.

Calculate the height of cone and its Volume. What part of circle is your hat? 

 

Sabri Taşkın Middle School / Hats