Elements of geometry, geometrical analysis, and plane trigonometry

AC is equal adjacent angle analogy angle ABC angle ACB angle BAC angle BCD angle equal base AC bisect centre chord circumference consequently the angle contained angle decagon describe arcs intersecting diagonals diameter distance diverging lines double draw equal angles equal to BC equilateral triangle equivalent to twice exterior angle given straight line greater Hence hexagon hypotenuse inscribed isosceles triangle join Let ABCD let fall parallel to CD pentagon perpendicular point G polygons PROB produce PROP quadrilateral figure radius rectangle contained rectilineal figure rence rhomboid right angles Scholium segments semicircle semiperimeter side AC sides AB square of AC squares of AB tangent THEOR triangle ABC twice the rectangle twice the square vertex vertical angle whence Wherefore