Explanation: When a solid completely penetrates another solid, there will be two lines of intersection. These lines are called lines of interpenetration. The portion of the penetrating solid which lies hidden within the other solid is shown by dotted lines.

When one cylinder intersects another cylinder which type of intersection curve will obtain?

7. Type of cylinder to cylinder intersection Examples of the intersection of two cylinders  a one-branch curve, which occurs when one cylinder passes only partially through the other. ( This type of intersection is called partial intersection .)

When a solid is opened out after cutting and its complete surface is laid on a plane the surface of the solid is said to be blank 1 surface?

When a solid is opened out and its complete surface is laid on a plane, the surface of the solid is said to be developed. The figure thus obtained is called a development of the surfaces of the solid or simply development. Development of the solid, when folded or rolled, gives the solid. T. L.