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The perimeter of this gated fence is the sum of all 4 sides.

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The tire is a circle because all points on the circle are the same distance from the center.

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The pizza slice is a triangle because it has 1 side that is shorter than the others and it has 3 sides total.

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The mousepad is a square because it has 4 right angles and all sides are the same length.

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The dollar bill is a rectangle because there are 2 pairs of congruent and parallel sides.

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The railroad crossing sign is making vertical angles because each angle is opposite to another angle.

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The street sign is making a right angle because the angle is exactly 90º.

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The two black hands on the clock are making an obtuse angle because it is bigger than 90º

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If each side of the tool is a ray, the angle is acute because it is less than 90º.

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The ray in the middle of the field is a bisector because it is splitting the angle in two parts.

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The white segments are the same shape and size making them congruent to each other.

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The two sides on the building intersect at the pink line.

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The lines on this football field are parallel because they will never intersect.

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A, B, C and all other colored dots on the wheel are points because they are just a set spot on the wheel.

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This checker board is a plane because it contains points and lines.

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The checkers on the checkerboard are coplanar points because each checker, representing a point, is on the plane.

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This pencil is a line segment because it has a starting point and an ending point.

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This intersection intersects at one point which is the middle of the 'X' in this picture.