У прямоугольной трапеции 2 прямых угла, 1 тупой и 1 острый. Высота из тупого угла разбивает трапецию на прямоугольник и прямоугольный треугольник. Одна из сторон прямоугольника равна длине меньшего основания и равна 5. Один из катетов прямоугольного треугольника равен 22-5=17, а так как острый угол этого треугольника - 45 градусов, второй катет также равен 17. Второй катет является высотой и второй стороной прямоугольника. Таким образом, площадь прямоугольника равна 5*17=85, а площадь треугольника 17*17/2=289/2=144.5. Значит, суммарная площадь равна 144.5+85=229.5
1) The waitress brought our tea a few minutes ago. The waitress hasn't brought our tea yet. 2) The bell has just rung. The bell rang some minutes ago. 3) He has already gone to London. He went to London last week. 4) The boys played football in the yard yesterday. The boys have played football in the yard many times. 5) Mother has read a new novel by Aitmatov this month. Mother read a new novel by Aitmatov last year. 6) Students have already cleaned their classrooms. Students cleaned their classrooms last Saturday. 7) The teacher has just explained a new rule. The teacher explained a new rule at the pervious lesson. 8) Ann has just done her homework. Ann did her homework on Friday. 9) They have discussed this problem many times. They discussed this problem a few days ago. 10) Granny has just made a birthday cake. Granny made a birthday cake yesterday. 11) The birds have already flown to the South. The birds flew to the South at the end of August. 12) The train has just come. The train came an hour ago. 13) Who did your friend speak to yesterday? Who has your friend just spoken to? 14) We have already written the words of Lesson 7. We wrote the words of Lesson 7 at the last lesson.
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