This is part of the series of 30 exercises developed during the 3D4KIDS program. One of the aims of this Erasmus+ program is to improve the knowledge of teachers regarding the 3d printing technology by developing some specific training materials. More info in the website: https://www.3d4kids.eu/ The lesson about the cone LEARNING OBJECTIVES • An equilateral cone • A rectangular triangle in cone • Understand rectangular triangle in cone • Calculating the high, radius, surface and volume of the cylinder 1. You have an equilateral cone. The height is 10 cm. Calculate the surface of a typical rectangular triangle and the surface and volume of the cone. Print the cone. 2. You have a cone. The height v is 8 cm. The line s is 10 cm. Calculate the radius, volume and the surface of the cone. Print the cone.