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«·’ðÕ… 18 - LET it be granted that a straight line may be drawn from any one point to any other point.˛
«·’ðÕ… 17 - When equals are taken from unequals, the remainders are unequal. 6. Things which are double of the same thing, or equal things, are equal to each other.˛
«·’ðÕ… 86 - III.), is a circle. If the plane pass through the centre, then, as every point in the surface of the sphere is equidistant from its centre, the section is a plane figure, every point of whose periphery is equidistant from a certain point within it, and the figure is therefore a circle. But if the plane do not pass through...˛
«·’ðÕ… 26 - Therefore all the interior angles of the figure, together with four right angles, are equal to twice as many right angles as the figure has sides.˛
«·’ðÕ… 114 - TO THEIR DIFFERENCE ; So IS THE TANGENT OF HALF THE SUM OF THE OPPOSITE ANGLES', To THE TANGENT OF HALF THEIR DIFFERENCE.˛
«·’ðÕ… 63 - If from a point without a circle two straight lines be drawn, one of which...˛
«·’ðÕ… 147 - Mathematical o>jgraphy.) the arc of the equator, intercepted between the first meridian...˛
«·’ðÕ… 64 - If from any point without a circle straight lines be drawn touching it, the angle contained by the tangents is double the angle contained by the straight line joining the points of contact and the diameter drawn through one of them.˛
«·’ðÕ… 139 - Given the vertical angle, the difference of the two sides containing it, and the difference of the segments of the base made by a perpendicular from the vertex ; construct the triangle.˛
«·’ðÕ… 86 - ... half a right angle, as the tangent of half the sum of the angles, at the base of the triangle to the tangent of half their difference.˛