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Use a 15 cm long, 12 cm wide rectangular paper to cut the largest square. What is the area of the cut part?
12*12=144
A square paper with side length of 25.12 decimeters forms a cylinder. How many square decimeters is its bottom area?
Use a piece of rectangular paper 6cm long and 4cm wide to form a cylinder. How many square centimeters is its side area?
Cut a cylinder with a radius of 5cm at the bottom and a height of 10cm along its diameter. How many square centimeters is the area of a cut surface?
1、
Cylinder radius = 25.12 ÷ (2 * 3.14) = 4 decimeters
Area of column bottom = 3.14 * 4 * 4 = 50.24 square decimeter
2、
The side area of the cylinder is equal to the area of the rectangle = 6 * 4 = 24 square decimeters
3、
The cut surface is a rectangle formed by height and diameter, with an area of (2 * 5) * 10 = 100 square cm
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