1. The first step is to draw a triangle on the poster board.

2. Step 2, then cut the triangle with scissors or art knife.

Step 3, then roll up the triangle to make your cone. You can adjust the sharpness of the cone by making the angle wider or narrower.

4. Step 4, then stick the seam with tape or pay taxes.

Step 5: Finally, you can paint colors or other decorations on the cone.

Extended data:

Cone, a mathematical term, has two definitions. Analytic geometry definition: A spatial geometry consisting of a conical surface and a plane intersecting it (satisfying that the intersection line is a circle) is called a cone. Definition of solid geometry: The surface formed by taking one right-angled side of a right-angled triangle as the axis of rotation and the other two sides rotating is called a cone. The right-angled side is called the axis of a cone.

Expand:

The practice of cylinder:

Preparation materials: paper, pen and scissors.

1. Press the cover on white paper and draw two circles along the cover with a pen.

2. Measure the diameter of the circle with a ruler. My diameter is 7.2 cm.

3. Measure the place on the paper with a ruler 22.6 cm long, draw one place, extend it by one cm, and draw another place. The extended centimeter is the extra part that needs to be bonded.

4. Fold the extra centimeter from top to bottom.

5. Leave a centimeter on the upper and lower edges of the paper for the bonding of the top ring and the bottom ring, and fold a trace from the upper and lower centimeters.

6. Use scissors to cut off the two one-centimeter edges left up and down to avoid forming a circle and bulging.

7. Cut off the two circles you just drew with scissors for later use.

8. Apply glue to the paper used on the side of the cylinder at the vertical left centimeter.

9. Leave this centimeter edge inside, roll up the paper and stick it on. The sides of the cylinder are surrounded.

10, put a circle of glue on the edge of a circle.

1 1. Put the ring on a closed cylinder and bond it with countless small teeth. The edges should be aligned and glued together.

12. Apply glue to the other round edge and stick it to the toothed edge at the bottom.

13. Stick two circles on the top and bottom of the cylinder respectively, and a complete cylinder is completed.