Discussion
A solid formed on revolving a right angled triangle about its height is
Answer: C
Spin a right-angled triangle about one of its perpendicular sides. That side stays fixed as the axis, the other perpendicular side sweeps out a flat circular disc at the bottom, and the hypotenuse sweeps out a slanted surface meeting at a point on the axis.
The result is a right circular cone, with the height equal to the axis side, the base radius equal to the other perpendicular side, and the slant height equal to the hypotenuse.
Revolving a rectangle instead would give a cylinder, and revolving about the hypotenuse would give two cones joined base to base.
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