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An arc is a portion of the circumference of a circle.

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two objects are similar if they both have the same shape, or one has the same shape as the mirror image of the other.

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A polygon is any 2-dimensional shape formed with straight lines. Triangles, quadrilaterals, pentagons, and hexagons are all examples of polygons. The name tells you how many sides the shape has.

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parallel lines are lines in a plane which do not meet; that is, two straight lines in a plane that do not intersect at any point are said to be parallel. Colloquially, curves that do not touch each other or intersect and keep a fixed minimum distance are said to be parallel.

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obtuse angles are observed whenever two sides, arms or surfaces deviate widely.

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A triangle is a polygon with three edges and three vertices. It is one of the basic shapes in geometry.

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A Cylinder is a solid geometric figure with straight parallel sides and a circular or oval cross section.

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Perpendicular lines are lines that intersect at a right (90 degrees) angle.

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

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congruent shapes have the same size and shape. This means that the sides and segments or two shapes have the same length. And, the angles possess the same measurements.