two planes next to each other
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The Military
A real-life example of a line and a plane intersecting can be observed when a beam of sunlight (the line) shines through a window (the plane) into a room. The line of sunlight travels in a straight path, while the window represents a flat surface where the light enters the room. The point where the sunlight hits the floor or any object inside the room marks the intersection of the line and the plane.
a real life example of an octagon is a stop sign.
A pennant is a real life example of an isosceles triangle.
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a piece of paper
The Military
a sheet of paper
doesn't exist in reality
Real life is a real life example!
In building construction, you usually have one horizontal plane (that floors) that is intersected by a vertical plane (the walls or support beams).
Coplanar just means that all forces act within a single plane, rather than in three dimensions. Examples aren't really necessary -- it's really a mathematical abstraction, because in the real world forces act in three dimensions.
a Television is a real life example of a Cube A dice is a real life example of a cube
A wheelchair ramp is a real life example of an inclined plane. It allows individuals in wheelchairs to move between different elevations with less effort than a direct vertical ascent. The ramp's incline reduces the force needed to push the wheelchair up an otherwise steep slope.
a real life example of an octagon is a stop sign.
An angle formed as a see-saw is a real life example.