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Two angles whose measure adds up to 90 degrees. The gate is a complementary angle because the right angle has a line in the middle, making it two angles, and 90 degrees.

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Two angles whose measure adds up to 180 degrees. The tennis court shows supplementary angles because the line is 180 degrees, with the line in the middle making it two angles.

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An angle that is more than 90 degrees. The hanger is obtuse because it is more than 90 degrees.

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An angle less than 90 degrees. This birds beak is less than 90 degrees, and is therefore an acute angle.

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A polygon with four equal sides and four right triangles. This rubix cube is a square because all the sides are equal and 90 degrees each.

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Their sides form two pairs of opposite rays. The ceiling fan is a vertical angle because the metal intersects, and two pair of opposite rays are then formed.

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An angle whose measure is 90 degrees. This street sign measures 90 degrees because it is a square.

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A round plane figure whose boundary consists of points equidistant from a fixed point(the center). The Ferris wheel is a circle because the distance from the middle is the same for every line.

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Line segments that have the same length. The pool is a rectangle which makes the two opposite side congruent.

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The point that divides the segment into two congruent segments. The soccer field has a midpoint that lets players know where the field cuts in half.

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Points that lie on the same line. The pool table is the plane, and the points would be the balls on the pool table.

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Two angles that share a common vertex and side, but have no interior points.
The angles share a common vertex and side, but as you can see, they have no interior points.

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Angles with the same measure. Both sides of the house are congruent because they both have the same angle measure.

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A ray that divides an angle into two congruent angles. In order for the volleyball net to be up straight, rope on either side puts pressure to keep it up.

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Lines that do not intersect and are coplanar. The door sides have to be parallel for the door to fit in the doorway, making the door sides parallel lines.

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If two distinct planes intersect, then they intersect in exactly 1 line.

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If two distinct lines intersect, then they intersect in exactly 1 point.
The two distinct lines on the pizza will only intersect at that point.

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Has no dimension, It is represented by a dot
The elevator keys have no dimension, and are just a point.