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Railroad crossing sign
Vertical angles are pair angles formed when two lines intersect.

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A house
For describing the size of a house by talking about its floor area, or for working out how much wire is needed to fence off a field.

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A coin
A coin is an example of a circle because it has no end. Circles are simply closed curves equidistant from a fixed center. Circles are special ellipses that have a single constant radius around a center.

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Lines on a fence
These are congruent segments because they all have the same length even if they don't have to be parallel.

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A pyramid
Has three edges and three vertices where it goes up to one point at the apex.

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A white board
This is an example of a rectangle because it is a four sided flat shape with all interior angles are right angles.

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A ruler is an example of a right angle because it has a 90 degree angle in the corner.

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A pizza slice
This is an acute angle because if we slice a pizza into 5 or more slices, each slice of pizza will make an acute angle. Each slice of the pizza makes an acute angle.

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An open fan
An open fan is an example of an obtuse angle because it is open to a 180 degree angle.

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If two distinct lines intersect then they intersect in exactly one line

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If two distinct lines intersect then they intersect in exactly one line

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People standing next to each other
This is an example of two distinct lines in one line because it is two points next to each other creating a line.

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Legs
Legs are an example of parallel lines because it is two lines that lie in the same plane that never intersect or meet each other.

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If two distinct lines intersect then they intersect in exactly one point 

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If two distinct lines intersect then they intersect in exactly one point 

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An X
An X is an example of this because it is two lines that intersect in the center.

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Pencil
A line segment is one-dimensional. It has a measurable length, but has zero width. If you draw a line segment with a pencil, examination with a microscope would show that the pencil mark has a measurable width. The pencil line is just a way to illustrate the idea on paper.

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The Equator
The equator is an example of a great circle. The line through the centre of the sphere perpendicular to the plane of a great circle meets the sphere in two points called the poles of the great circle.

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Football players on the line of scrimmage are collinear. This is because multiple people are lined up next to each other forming a line with multiple points.

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Pool Table
When you play pool, the pool table would be the plane and the balls would be the different points and this is coplanar because the balls lie in the same plane (the table) and majority of them (balls) are in common places.

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Piece of paper
In mathematics, a plane is a flat, two-dimensional surface that extends infinitely far. While a piece of paper is a flat, and double sided sheet.

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Tip of a writing utensil.
A point is the fundamental element of geometry. If we put the tip of a pencil on a paper and press it lightly, we see a very small mark on the paper. ... It is called a point.