Euclid — "An acute angle is an angle less than a right angle."
An acute angle is an angle less than a right angle.
An acute angle is an angle less than a right angle.
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"Rectilineal figures are those which are contained by straight lines..."
"The extremities of a line are points."
"The laws of nature are but the mathematical thoughts of God."
"To apply a given parallelogram to a given straight line in a given rectilinear angle."
"A ratio is a sort of relation in respect of size between two magnitudes of the same kind."
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