Derivation of the law of cosines via the incircle - Larry Hoehn The law of cosines can be derived without using special cases and without using...
The isosceles trapezoid and its dissecting similar triangles - Larry Hoehn Isosceles trapezoids are dissected into three similar triangles and...
A new formula concerning the diagonals and sides of a quadrilateral - Larry Hoehn We derive a formula relating the sides and diagonal sections of...
