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AC is equal alternate angle ABC angle ADB angle BAC angles are equal arc BC base BC bisected centre circle circumference coincide conversely described diameter divided double draw drawn equal angles equal Ax equal to AC equiangular equimultiples Euclid exterior angle extremities fall figure fore fourth Geometry given straight line greater homologous interior Join less Let ABC magnitudes meet multiple opposite angles parallel parallelogram parallelogram AC pass perpendicular Place polygon produced PROP propositions proved Q.E.D. PROP radius reason rectangle contained rectilineal figure right angles sector segment semicircle shown side BC sides similar square stand straight line taken THEOREM thing third angle touches the circle triangle ABC twice Wherefore
Side 12 - If two triangles have two sides of the one equal to two sides of the...
Side 5 - When a straight line standing on another straight line makes the adjacent angles equal to one another, each of the angles is called a right angle ; and the straight line which stands on the other is called a perpendicular to it.
Side 42 - ... figure, together with four right angles, are equal to twice as many right angles as the figure has be divided into as many triangles as the figure has sides, by drawing straight lines from a point F within the figure to each of its angles.
Side 76 - Any two sides of a triangle are together greater than the third side.
Side 49 - In every triangle, the square on the side subtending either of the acute angles, is less than the squares on the sides containing that angle, by twice the rectangle contained by either of these sides, and the straight line intercepted between the...
Side 57 - ... figures are to one another in the duplicate ratio of their homologous sides.
Side 64 - ... in a segment less than a semicircle, is greater than a right angle...