An isosceles right triangle has two perpendicular legs of length 1 inch. it is rotated 360° about one of its legs in order to form a 3-dimensional figure. what is the best description of the 3-dimensional figure that is formed? it is a triangle-based pyramid with four congruent faces it is a cone with base radius of 1 inch and vertical height of 1 inch it is a cone with base radius of 2 inches and vertical height of 1 inch it is a cylinder with base radius of 1 inch and vertical height of 1 inch