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AC is equal angle ABC angle ADB angle AEF angle BAC angle EDF angles are equal arc BC base base BC bisected centre circle circumference coincide Conversely described diameter divided double draw drawn equal angles equal Ax equal to AC equiangular Euclid exterior angle extremities fall figure fore four fourth Geometry given straight line greater interior Join less Let ABC magnitudes meet multiple opposite angles parallel parallelogram parallelogram BF pass perpendicular Place polygon produced PROP propositions proved 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
Page 12 - If two triangles have two sides of the one equal to two sides of the...
Page 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.
Page 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.
Page 76 - Any two sides of a triangle are together greater than the third side.
Page 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...
Page 57 - ... figures are to one another in the duplicate ratio of their homologous sides.
Page 64 - ... in a segment less than a semicircle, is greater than a right angle...