In isosceles triangles the angles at the base are equal to one another, and, if the equal straight lines be produced further, the angles under the base will be equal to one another.
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"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."
"If a number be the least that is measured by any prime numbers, it will not be measured by any other prime number except those originally measuring it."
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"If a straight line be cut into two equal parts and also into two unequal parts, the rectangle contained by the unequal parts together with the square on the line between the points of section is equal…"
"If a straight line fall on two parallel straight lines, it makes the alternate angles equal to one another, the exterior angle equal to the interior and opposite angle, and the interior angles on the …"
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