The following is an expanded view of a cuboid carton. Please calculate the surface area of the cuboid carton. (unit: cm)

The following is an expanded view of a cuboid carton. Please calculate the surface area of the cuboid carton. (unit: cm)

As can be seen from the figure, the length is 5cm. Imagine folding it up, that 7cm is the height lengthening, so the height is 2cm and the width is 4cm
It's ready for calculation
s=（5*2+5*4+2*4）*2=38*2=76

The side area of a cylinder is 36 square decimeters, and the diameter of its bottom is 20 cm. What is its volume

20 cm = 2 decimeters
2 / 2 = 1 --- radius
36 ÷ (3.14 * 2) = 5.73 (decimeter) - high
Volume: 3.14 * 1 * 1 * 5.73 = 17.9922 (cubic decimeter)

The diameter of the bottom surface of a cylinder is 6 decimeters, the height is 10 centimeters, and its side area is 1___________ Square decimeter

6 * 3.14 * 10 / 10 = 18.84 square decimeters

Expand the side of a cylinder to get a square. The radius of the bottom of the cylinder is 0.5 decimeter. What is the height of the cylinder?

2 × 3.14 × 0.5, = 6.28 × 0.5, = 3.14 (decimeter); a: the side length of this square is 3.14 decimeter