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these are vertical angles because the metal sheets intersecting make two pairs of angles

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these are complementary angles because where the hands are positioned makes two angles that add up to 90 degrees

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this represents a straight angle because the table measures 180 degrees

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this is a square because the sides that make up the chess board are all congruent

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this is a right angle because the wood in this treehouse forms an angle that is 90 degrees

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this is a rectangle because the welcome mat has two sides with one being longer than the other

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this represents postulate 1-3 because when the planes intersect they only intersect on one of the bars

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this represents postulate 1-2 because the lines making up the tracks share a point when they intersect

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this is a plane because they are flat and keep going

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the lines on this track field are parallel because they will not intersect each other

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this is an obtuse angle because the measure of the angle between two of bars is greater than 90 degrees

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this is a line segment because bar stops at one point and begins at another

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this is a line because it goes on as far as the eye can see straight

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these are congruent angles because the angles inside each of the triangles have the same measure

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these points are coplanar because they all are on the same plane or this  picture, the same face of the dresser

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these are collinear points because all three basketballs are in a straight line

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this is an adjacent angle because the two pizza slice, which represent the angle, share a side

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this is an acute angle because the angle of the face of the pyramid is less than 90 degrees