Question

If a right angled triangle is rotated about one of its perpendicular sides, then the shape obtained will be a ________ .

• A. cone
• B. cylinder
• C. cube
• D. cuboid

Answer 1

The correct option is A

cone

In the above figure, l is the slant height, h is the height and r is the radius. h and r are perpendicular to each other. So, h, r and l forms a right angled triangle.

When we rotate the triangle about one of its perpendicular sides, then the shape obtained will be a cone as illustrated in the figure.