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ABCD angle ABC angle ACB angle BAC angle BCD base BC BC is equal bisected Book centre circle ABC circumference co-sine cylinder demonstrated described desinition diameter draw drawn E. D. PROP equal angles equiangular equilateral equilateral polygon equimultiples Euclid exterior angle faid fame altitude fame base fame manner fame plane fame ratio fame reason fides fore given straight line gnomon greater hypotenuse inscribed join less Let ABC line BC magnitudes meet opposite angle P R O parallel parallelepiped parallelogram perpendicular polygon prism proportionals proposition radius rectangle contained rectilineal figure remaining angle segment shewn sigure similar sine sirst solid angle spherical angle spherical triangle square of AC straight line AC supersicies T H E O tangent touches the circle triangle ABC triangle DEF wherefore
Page 27 - If two triangles have two angles of the one equal to two angles of the other, each to each, and one side equal to one side, viz. either the sides adjacent to the equal...
Page 18 - If, at a point in a straight line, two other straight lines upon the opposite sides of it, make the adjacent angles, together equal to two right angles, these two straight lines shall be in one and the same straight line.
Page 9 - Wherefore, from the given point A, a straight line AL has been drawn equal to the given straight line BC.
Page 3 - A circle is a plane figure contained by one line, which is called the circumference, and is such that all straight lines drawn from a certain point within the figure to the circumference, are equal to one another.
Page 33 - Therefore all the angles of the figure, together with four right angles, are equal to twice as many right angles as the figure has sides.
Page 12 - ABC: and it has also been proved that the angle FBC is equal to the angle GCB, which are the angles upon the other side of the base. Therefore the angles at the base, &c.
Page 6 - Let it be granted that a straight line may be drawn from any one point to any other point.
Page 166 - But by the hypothesis, it is less than a right angle ; which is absurd. Therefore the angles ABC, DEF are not unequal, that is, they are equal : And the angle at A is equal to the angle at D ; wherefore...