translations,rotations, cross sections

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A cone is cut by a plane that is perpendicular to its base. Which of the following could be the shape of the cross-section formed?

The point P (-5, -10) is rotated 180° about the origin. What are the coordinates of P\'?

The cross section of a 3-D figure is shaped like a cirlce. Which could NOT be the 3-D figure?

The point (7, -3) is translated 4 units to the left and 10 units down. What are the new coordinates of the translated point?

A cyclinder is horizontally cut by a plane. What is the shape of the cross-section formed?

If a cube is cut by a plane diagonally what is the cros section formed

The cross section of a 3-D figure is shaped like a cirlce. Which could NOT be the 3-D figure?

If a square on a graph has a point of [0,-3] and is translated 3 units to the left and 3 units up what is the new point of the square?