Question

which three - dimensional object is formed when the shape is rotated about the axis as shown?
○ pyramid
○ cone
○ triangular prism
○ cylinder
(there is an image on the right side of the text, showing a triangle and an axis with a rotation symbol around the axis.)

Explanation:

When a right - triangle is rotated about one of its legs (the axis in the given problem), the three - dimensional object formed is a cone. A pyramid is formed by connecting a polygonal base to a point (apex). A triangular prism is a 3 - D object with two triangular bases and three rectangular lateral faces. A cylinder is formed by rotating a rectangle about one of its sides.

Answer:

cone