Current location - Plastic Surgery and Aesthetics Network - Wedding planning company - The part of this hat is a cylinder, and the brim part is a ring, all made of cloth. It is known that the radius, height and brim width of the hat top are 1 decimeter, so
The part of this hat is a cylinder, and the brim part is a ring, all made of cloth. It is known that the radius, height and brim width of the hat top are 1 decimeter, so
3. 14×( 1+ 1)2
=3. 14×4
= 12.56 (square decimeter)
3. 14× 1×2× 1
=3. 14×2
=6.28 (square decimeter)
12.56+6.28= 18.84 (square decimeter)
Answer: To make this hat, at least 18.84 square decimeter cloth should be used.