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ABC is equal ABCD angle ABC angle BAC arch base base ABC bisect BOOK called centre chord circle circumference coincide common cone Consequently cylinder demonstrations described diagonals diameter difference distance divided draw drawn equal angles equal bases equiangular exterior angle extremities figure follows fore geometry given straight line gles greater half Hence interior intersect join less Let ABC magnitude manner mean meet opposite angles opposite side paral parallel parallel lines parallelogram pass perp perpendicular plane polygon prism produced Prop proportional PROPOSITION proved pyramid Q. E. D. Cor quantities radius ratio rectangle contained remaining respects right angles segments side AC sides similar solid square stand straight line surface tangent THEOREM third triangle ABC wherefore
Side 36 - Any two sides of a triangle are together greater than the third side.
Side 42 - To draw a straight line through a given point parallel to a given straight line. Let A be the given point, and BC the given straight line...
Side 30 - To bisect a given finite straight line, that is, to divide it into two equal parts. Let AB be the given straight line : it is required to divide it intotwo equal parts.
Side 20 - LET it be granted that a straight line may be drawn from any one point to any other point.
Side 38 - Problem. At a given point in a given straight line to make a rectilineal angle equal to a given rectilineal angle.
Side 113 - Wherefore also the angle BAD is equal to the angle CAD : Therefore the angle BAC is cut into two equal angles by the straight line AD.
Side 24 - DE ; the point B shall coincide with the point E, because AB is equal to DE; and AB coinciding with DE, AC shall coincide...