Is the square root of negative 5 a rational irrational or imaginary

Farnesene is a sesquiterpene. how many different isomers arising from double-bond isomerizations are possible? g

How to do this , and can some one explain

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.