3. 14×2? = 12.56÷2 ∏( pai)= 5×3. 14 = 3. 14×3？ =

2.8÷0.4= 1.5× 1.5= 0.5×0.5= 12.56÷3. 14=

2. Saw a piece of cylindrical wood with a bottom circumference of 25. 12cm and a height of 50cm into two pieces of cylindrical wood with a height of 25cm, and the surface area increased by 100.48cm? What is the surface area of this piece of wood in square centimeters?

3. Cylindrical oil drum with bottom radius of 0.3m and height of1m.. Make two such oil drums 5m? Is there enough iron sheet?

4. A part consists of a cylinder and a rectangle (as shown on the right). The length, width and height of a cuboid are 5cm, 4cm and 3cm respectively. The height of the cylinder is 4.5cm, and the diameter is 2.4cm. If you want to draw the surface of this part, how many square centimeters is the drawing area? (Numbers are reserved as integers)

Graphic placement: the cylinder is on a cuboid, and one bottom surface of the cylinder coincides with a small part of the bottom surface of the cuboid, that is, the cylinder has two bottom surfaces without solving.

5. The drum has a diameter of 1.5m and a width of 1.8m, and rotates 20 times per minute. How many square meters of road surface does this roller run over every minute?

Jump.

Is the lateral area of a cylinder 188.4dm? , height 15dm. What is the surface area of this cylinder?

Hoo hoo! I'm exhausted! Question 4: I don't know much about graphic delivery. Can lz understand?

Do it, adopt it, don't copy it!