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The midpoint of the x in this sign would be where the two lines intersect right in the middle.

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The measure of the angle along the side of the ruler would be a straight angle because it would measure 180 degrees.

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An example of collinear points would be, if there was a point on the main line where a smaller line intersected, then there would be four collinear points on the same line.

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This bat can be an example of a line segment because if it were measured it would have one start point and one endpoint.

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The dot in the middle of this bullseye is an example of a point because it has no size and indicates a location.

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This grass field is an example of a plane because it can represent a flat surface.

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The hands on this clock are an acute angle because the measure of the angle would be between 0 and 90 but not exactly 90.

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The hands on this clock are an obtuse angle because their measure would be bigger than 90 degrees but less than 180 degrees.

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The hands on these clocks are at a right angle because they measure 90 degrees.

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This sign is a triangle because it is a polygon with 3 sides.

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This rug is a rectangle because it has 4 straight sides and 4 right angles with unequal adjacent sides.

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This picture frame is a square because it has four equal sides and four equal angles.

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This pizza is circle because it is round all the way around and it is a closed figure.

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These two walls on the left and right can both be an example of postulate 1-3 because both of the walls are planes that are intersecting at a line.

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This cross would be an example of a postulate 1-2 because the two wooden beams intersect at one point.

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These road lines are parallel lines because they never intersect.

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Each of these football lines could be an example of a line because they are all one dimension.

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If this cookie was a plane, all the chocolate chips would be coplanar points because they are all on the same plane.