The arithmetic mean (a) of two numbers (a and b) is given by the formula a=a+b/2, and their geometric mean (g) is given by g=√ab. their harmonic mean (h) is given by the formula g= √ah. which formula correctly gives h in terms of a and b?

Given: ae ≅ ce ; de ≅ be prove: abcd is a parallelogram. we have that ab || dc. by a similar argument used to prove that △aeb ≅ △ced, we can show that △ ≅ △ceb by. so, ∠cad ≅ ∠ by cpctc. therefore, ad || bc by the converse of the theorem. since both pair of opposite sides are parallel, quadrilateral abcd is a parallelogram.