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The continuous line forming the boundary of a closed geometric figure. the fence is a perimeter for the cows.

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If two distinct planes intersect, then they intersect in exactly 1 line. The pizza intersects in one line

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The point on a line segment or an arc that is equidistant, when measured along the line or the arc, from both endpoints. the middle of the pencil is an example.

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Two angles are Complementary when they add up to 90 degrees (a Right Angle). the hands on the clock are an example.

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two angles that have the same vertex and a side in common. The pizza is the same when yo take them apart.

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two or more angles that are identical to each other. The triangle are an example, because they are the same size.

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each of the pairs of opposite angles made by two intersecting lines.An example of a vertical angle are scissor

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an angle whose sides lie in opposite directions from the vertex in the same straight line and which equals two right angles. Ruler is straight

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an angle of 90°, as in a corner of a square or at the intersection of two perpendicular straight lines. The stair steps are an example of a right angle.

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any angle greater than 90°. The part under the hook is an example of an obtuse angle.

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An angle that measures between 90° and 0°. The pizza point is an example of an acute angle

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A type of quadrilateral, whose opposite sides are equal and parallel. The phone is in the shape of a rectangle

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a plane figure with four equal sides and four right (90°) angles. The rubiks cube is a square

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A triangle is a closed, 2-dimensional shape with 3 sides, 3 angles, and 3 vertices. The play button is a triangle

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A closed shape formed by tracing a point that moves in a plane such that its distance from a given point is constant. The dartboard is a circle.

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A point is an exact location. It has no size, only position. this relates to a point because the finger is pointing.

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A closed two-dimensional or flat figure.  A book is like a plane, because it is flat when closed

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A straight one-dimensional figure having no thickness and extending infinitely in both directions.