Traditional Culture Encyclopedia - Traditional stories - Make a cylindrical light box with colored paper. The height of the light box is 40 cm, and the circumference of the bottom circle is 48.2 cm. How much colored paper does it need on one side at least?
Make a cylindrical light box with colored paper. The height of the light box is 40 cm, and the circumference of the bottom circle is 48.2 cm. How much colored paper does it need on one side at least?
For example, if a cylinder expands along its height, isn't there a rectangle and two circles? And that rectangle is the required edge! The length of the rectangle is the perimeter of the bottom circle, and the width is the height of the light box. So 40×48.2= 1928(cm? )
Understand?
This is my own idea, I hope the landlord will adopt it!
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