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ExploreLearning also makes Reflex, an online, game-based system for math fact memorization. [1] ExploreLearning is a business unit of Cambium Learning Group. [2]
indicates that the column's property is always true for the row's term (at the very left), while indicates that the property is not guaranteed in general (it might, or might not, hold).
In biology, a reflex, or reflex action, is an involuntary, unplanned sequence or action [1] and nearly instantaneous response to a stimulus. [2] [3] The simplest reflex is initiated by a stimulus, which activates an afferent nerve. The signal is then passed to a response neuron, which generates a response.
A simple concave polygon has at least one interior angle, that is, a reflex angle. In Euclidean geometry , the measures of the interior angles of a triangle add up to π radians, 180°, or 1 / 2 turn; the measures of the interior angles of a simple convex quadrilateral add up to 2 π radians, 360°, or 1 turn.
A concave polygon will always have at least one reflex interior angle—that is, an angle with a measure that is between 180 degrees and 360 degrees exclusive. [4]
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