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The lining of tiles right before the water show the perimeter because they are the entire length of it

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the bottom edge of this knife is a straight angle because it measures exactly 180 degrees

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this is a midpoint because the middle of the line is shown by the change in color

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this angle is obtuse because it measures over 90 degrees

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the floors of this building are all right angles because they all measure 90 degrees

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the angle of this opened door is acute because it is less than 90 degrees or if it were strait open

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the sides of the box are rectangles because they have four sides made of 2 parallel lines

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this is a circle because it is a round figure with no sides and is equal in radius no matter it is measured from on the circle

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these chocolates are triangles because they have 3 sides

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the side of this box is a square because it has four sides that are all equal

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this rubix cube shows congruent segments on every side because all the segments are same size

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this is a postulate 1-3 because it has 2 planes that intersect on one line

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the lines on the fence are parallel because they are all going at out at the same angle meaning that no matter how far they extend they will never touch

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the red x is a postulate 1-2 because it has 2 lines that intersect at one point

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the white line in the middle is a line segment because it has no thickness and has 2 points where it starts and ends.

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the sides of the road are lines because they have no thickness and don't have a foreseeable end

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This is a plane because it is flat 2 dimensional surface