Euclid — "A boundary is that which is an extremity of anything."
A boundary is that which is an extremity of anything.
A boundary is that which is an extremity of anything.
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"Let it be granted that a circle may be described with any center and any radius."
"Let it be granted that all right angles are equal to one another."
"An obtuse angle is an angle greater than a right angle."
"A plane angle is the inclination of the lines to one another, when two lines meet one another, but are not in the same straight line."
"There are infinitely many prime numbers."
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