Самомтоятельная работа по геометрии по теме "Признаки параллельности прямых" (7 класс)

                             Вариант 1                                                                                

        1.                                                а                                               

Дано:  ˂ 1 = 54° ,  ˂2 = 126°

Доказать:      а ││b

                                                             b

                                                                       c

     2.

                                                                                                                              

                                                а                                               

Дано:  ˂ 1 = 57° ,  ˂2 = 67°

Каково взаимное расположение  прямых a  и b

                                                               b

                                                                      c

                    Вариант 2

                                                                                                                      

        1.                                        а                                              

Дано:  ˂ 1 = 67° ,  ˂2 = 113°

Доказать:      а ││b

                                                                              b

                                                              c

        2.                                                                                                                     

                                                        а                                              

Дано:  ˂ 1 = 57° ,  ˂2 = 133°

Каково взаимное расположение  прямых a  и b

                                                                      b

                                                              c