Euclid — "Things which coincide with one another are equal to one another."
Things which coincide with one another are equal to one another.
Things which coincide with one another are equal to one another.
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"To bisect a given rectilinear angle."
"In any right-angled triangle, the square on the side subtending the right angle is equal to the squares on the sides containing the right angle."
"The greatest common divisor of two numbers can be found by successive division."
"And when the lines containing the angle are straight, the angle is called rectilineal."
"To draw a straight line at right angles to a given straight line from a given point on it."
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