ABCD трапеция, описанная около окружности. AB=CD.P(ABCD)=16. BD=5 Найти площадь трапеции

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Dear Steve, Im in moscow. It's 1___ sunday today. It's so interesting here! I stay wiht Dasha's family. They don't 2___ eggs, they don't play 3 __ and they don't have 4__ . But they colour eggs. And their traditionalf food called 'paskha' and 'kulitch' is so tasty. I like it here. Tomorrow I'll go to yhe farm where Dasha's granny lives. We'll taste Granny's 6___ and Dasha will teach me to 7 ___ .

Best wishes, wendy

Слова: hide Easter play wooden spoons Egg hunt the Easter Bunny traditional delicious food

вектор ав= 2(вектор i) - 3(вектор j)
1) найдите координаты точки А если в(-1;4) 
2) найдите координаты середины отрезка ав 
3) напишите уравнение прямой ав.