the circumference, c, of a circle varies directly as the diameter, if the circumference is 44 cm, find the circumference when the diameter is 21 cm.

Express in the simplest form: (x^2+9x+14/x^2-49) / (3x+6/x^2+x-56)

What additional information is needed to prove that the triangles are congruent using the aas congruence theorem? o lolm o oama o zloa zlma o zlao – zlam

In triangle △abc, ∠abc=90°, bh is an altitude. find the missing lengths. ac=26 and ch=8, find bh.