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Guangzhou Circle is a circle.

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High Roller has a midpoint in the middle of the wheel.

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The Astronomical Clock is a plane because it is represented by a flat surface that extends without end and has no thickness.

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The Gherkin windows make vertical angles how they are positioned also they make a x shape for each time they intersect each other.

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The Louvre Pyramid has triangles.

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The square head is a square.

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The Atomium has complimentary angles which means that two angles make a right angle.

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The Tower Bridge is a straight angle because it is exactly 180 degrees.

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The Dancing House has an obtuse angle because of the curved part of the building and it is more than 90 degrees.

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The Dubai Frame has a perimeter because of the sum of sides it has.

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The Parthenon has a right angles because all the corners of the Parthenon have right angles and they are 90 degree angles.

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The Golden Gate Bridge is a line is a line because it goes 2 opposite directions without end.

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The Washington Monument is a part of a line that consists of one endpoint and all the points of the line on one side of the endpoint.

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The lines of the windows bisect each other in The Great Glass House.

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Stonehenge has rectangular shaped rocks.

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The Leaning Tower of Pisa has an acute angle because its leaning to the right and the bottom right corner is not a right angle so its an acute angle because it is less than 90 degrees.

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**Postulate 1-3: If two distinct planes intersect, then they intersect in exactly 1 line.

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**Postulate 1-3: If two distinct planes intersect, then they intersect in exactly 1 line.

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The Angel of the North is a postulate 1-3 because there is one plane that intersects with another plane which in this case is the body of the angel.

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**Postulate 1-2: If two distinct lines intersect, then they intersect in exactly 1 point.

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**Postulate 1-2: If two distinct lines intersect, then they intersect in exactly 1 point.

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The Eiffel Tower support beams is a postulate 1-2 because all the beams intersect to hold the Eiffel Tower.