Applying the Pythagorean theorem in the initial test, the 6+8= 10 bus is 10. In the second question, the semi-circular arc with a radius of 6 is 6 cakes long, which is the circumference of the cone bottom, so the radius of the bottom circle is 2 π r = 6 π r = 3.

The third question, if the length of the conical generatrix is two, the circumference of the bottom surface is two rows, and the central angle α=2∏/2=∏.