What are the length of sides KN and NM of the kite

12 point are triangles pqr and stu congruent? what is the congruency that proves they are congruent? what is the perimeter of triangle pqr?

Rhombus adef is inscribed into a triangle abc so that they share angle a and the vertex e lies on the side bc . what is the length of the side of the rhombus if ab=c, and ac=b.

Find the condition that the zeros of the polynomial f(x) = x^3+3px^2+3px+r may be in a. p.