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Going round in circles!
motion of a simple pendulum
Projectile motion is typically considered two-dimensional because it involves motion in a horizontal (x-axis) and vertical (y-axis) plane, while neglecting any motion in the third dimension (z-axis). In most basic analyses, the effects of gravity act only in the vertical direction, allowing the trajectory to be simplified to a parabolic path on a 2D plane. While projectiles can indeed move in three dimensions, such as when considering wind or launch angles, the fundamental equations of motion are often derived and analyzed in a two-dimensional framework for simplicity in understanding and calculation.
For example, if you keep on stacking squares (two dimensional figure) on top of one another, it will slowly form a cuboid (three dimensional figures). There is a mathematical way of calling it. Google it!
It is a figure that is flat. For example: triangle, square, pentagon...ect. A three dimensional figure is like a sculpture. Example: pyramid, cube prism...etc.