The diagonals of quadrilateral QRST intersect at P(0,3) has vertices at Q(1,6) and R(-4,5). What must be the coordinates of S and T to ensure that QRST is a parallelogram? I've asked this twice and honestly don't know if I've gotten an answer or not.

If sr is 4.5cm and tr is 3cm, what is the measure in degrees of angle s?

42. if 20 men can eat 200 kg of wheat in 40 days, then 10 men can eat 300 kg of wheat in how many days? a) 120 days b) 60 days c) 80 days d) none of these

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.