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A line is an infinitely long straight path that has no thickness. In

coordinate geometry, a line is defined as the set of points whose

coordinates satisfy a linear equation. In this example, lines are the electrical wires between posts.

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Pyramid is a three dimensional figure whose base is a polygon and whose other faces are triangles that share a common vertex.

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These are shapes that have the same size and shape. This example shows congruent triangles in the ferriswheel.

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It is obtuse angle if the measure is greater than 90 degrees and less than 180 degrees. In the example below, the angle formed by the sloping sides of the roof is obtuse.

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Dilation is a transformation in which the image is similar(but not congruent) to the preimage.
The diagram below is dilation.

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A regular polygon is a polygon that is both equilateral and equiangular. In this example, the regular polygon is a STOP sign, an octagon, which is both equilateral and equiangular.

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A rectangular prism is a solid, 3-dimensional object with six faces that are rectangles. An example of a rectangular prism is a box.

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The distance around a circle

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A mirror image kind of transformations

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When two lines intersect, four angles are formed. Each opposite pair are called vertical angles and are always congruent. In this example, vertical angles are formed by the blades of the fan.