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A B C ABCD absurd alternate angles angle ABC angle BAC angle equal angles A G F angles AGF applied base bc Bc is equal bisect Book called centre circle coincide common Const Construction demonstrated describe diagonal divided double draw drawn equal Ax equal bases equal Hyp equal Prop equal sides equal to CD equilateral triangle exterior falls figure GEOMETRY given angle given line given point greater interior angles interior opposite angle join less Let the line lines A B manner meet parallel parallel Prop parallelogram perpendicular PROB Problem produced proposition radii radius rectilineal figure remaining respectively equal right angles right angles Prop right line Schol Shilling side A B sides BC square standing Take THEOR triangle ABC triangles are equal vertex whole
Página 10 - Things which are halves of the same are equal to one another. 8. Magnitudes which coincide with one another, that is, which exactly fill the same space, are equal to one another.
Página 10 - Things which are equal to the same thing are also equal to one another. 2. If equals be added to equals, the wholes are equal. 3. If equals be subtracted from equals, the remainders are equal. 4. Things which coincide with one another are equal to one another.
Página 40 - All the interior angles of any rectilineal figure, together with four right angles, are equal to twice as many right angles as the figure has sides.
Página 10 - If a straight line meets two straight lines, so as to make the two interior angles on the same side of it taken together less than two right angles...
Página 10 - LET it be granted that a straight line may be drawn from any one point to any other point.
Página 39 - If the square described upon one of the sides of a triangle, be equal to the squares described upon the other two sides of it ; the angle contained by these two sides is a right angle.
Página 20 - If one side of a triangle be produced, the exterior angle is greater than either of the interior opposite angles.
Página 29 - If a side of any triangle be produced, the exterior angle is equal to the two interior and opposite angles ; and the three interior angles of every triangle are equal to two right angles.
Página 22 - Any two sides of a triangle are together greater than the third side.