What is the wavelength of a wave with a frequency of 262 Hz and a speed of 343m/s? A. 1.11x10^5m
B. 89,866m
C. 1.3m
D. 0.76m

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.