Question

what solid 3d object is produced by rotating the triangle about line m? choose 1 answer: a torus b tube c hollow cone frustum

Explanation:

The given figure is a right - angled triangle. When a right - angled triangle is rotated about one of its legs (line \(m\) here, which is parallel to one of the legs of the right - triangle and at a distance, or maybe the leg itself? Wait, actually, when a right - angled triangle is rotated about a line parallel to one of its legs (the non - hypotenuse side), the resulting solid is a hollow cone frustum (or a frustum of a cone). A torus is formed by rotating a circle about an external line, a tube is formed by rotating a rectangle about an external line. So the correct answer is the hollow cone frustum.

Answer:

C. Hollow cone frustum