Euclid — "To draw a straight line at right angles to a given straight line from a given po…"
To draw a straight line at right angles to a given straight line from a given point on it.
To draw a straight line at right angles to a given straight line from a given point on it.
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"What do I gain by learning these things?"
"If equals be added to equals, the wholes are equal."
"An obtuse angle is an angle greater than a right angle."
"Let it be granted that a straight line may be drawn from any one point to any other point."
"Further, of trilateral figures, a right-angled triangle is that which has a right angle, an obtuse-angled triangle that which has an obtuse angle, and an acute-angled triangle that which has its three…"
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