What property is represented by: 1•a = a ?​

Find the length of the normal and the angle it makes with the positive x-axis. (see pictured below)

Is of - 4x + 2? a. 3 b. 4 c. 6 d. 5

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.