Na certain city the temperature (in degrees fahrenheit) t hours after 9am was approximated by the function t(t)=80+15sin(πt12) t(t)=80+15sin⁡(πt12) determine the temperature at 9 am. 80 determine the temperature at 3 pm. 95 find the average temperature during the period from 9 am to 9 pm.

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.