Which figure would be rotated 360 degrees to create a cone with an altitude perpendicular to its base?

Just look at the perpendicular cross section, which would be an isosceles triangle. Split that in half vertically and you get a right triangle.

Answercounterclockwise rotation about the origin by 180 degrees followed by reflection about the y-axisexplanationthe given figure has verticesrecall that for counterclockwise rotation about the origin, when we rotate figure pqrs counterclockwise through an angle of 180° about the origin, the coordinates will becomenext, we reflect in the y-axis by negating the x-coordinates of the resulting figure to obtain,therefore the correct answer is c