An Elementary Geometry and Trigonometry

A B C acute angle adjacent altitude angle ABC angle BCD apothem arc or angle bisect centre chord circumference comp cone construct the triangle convex surface Corollary cosec decr diagonals diameter distance divided draw equiangular equilateral equivalent feet frustum Geom given angle given line given point given side half the arc homologous sides hypothenuse included angle incr inscribed internal angles isosceles triangle lines A B Logarithm multiplied mutually equiangular number of sides opposite side parallel parallelogram parallelopiped perimeter perpendicular prism PROBLEM quadrilateral radii radius ratio rectangle regular polygon respectively equal right angle right pyramid right triangle right-angled triangle Scholium secant segment side opposite similar triangles slant height sphere square straight line Tang tangent THEOREM THEOREM VIII trapezoid triangle ABC TRIGONOMETRY vertex vertices