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Def: A triangle that has a 90 degree interior angle.

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Def: two distinct co-planar lines that NEVER intersect. They have the same slope.

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Def: A triangle which has an obtuse angle as one of the interior angles.

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Def: half a circle that is a 180 degree arc.

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Def: The particular place of all points that are a fixed distance from a given point.

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Def: lines that intersect at a 90 degree angle, and have negative reciprocals

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Def: Flat surface extending in all directions.Planes are a two dimensions figure.

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Def: Similar geometric figures that share a common center.

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Def: The geometric figure formed at the intersection of two distinct lines

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Def: The geometric figure formed by two points. A straight path extending beyond the points in both directions.

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Def: A cube is a regular polyhedron for which all faces are squares.

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Def: A sphere is a 3-D solid consisting of all points equidistant from a given point. This point is the center of the sphere.

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Def: is a 3-D geometric figure with parallel congruent bases
The bases can be shaped like any closed plane figure and must be oriented identically.

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Def: A cone is a 3-D figure with a single base tapering to an apex. Base can be any simple closed curve

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Def: A polygon with 6 sides.

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Def: A polygon with 5 sides

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Def: A polygon with 8 sides.

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Def: A point on a line segment that divides it into two equal parts. The halfway point of a line segment.

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When two or more parts are identical after a flip slide or turn.

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Def: The pre-image is flipped across a line of reflection.

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Def: Three or more points are collinear if they lie on the same line.

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Def: identical in form

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Def: The line that divides something into two equal parts.

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Def: A quadrilateral with equal sides are angles.

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Def: Two figures that have the same shape.