Тест и упражнения по теме "Окружность"(Геометрия 8 класс)

Используя рисунок (рисунок не выполняй!) выпиши:

1.      Радиусы                                                                                      X               M                       N                         

2.     

О

 Диаметры                                                                                            С                                      Д

3.     

•  ООOO

Касательные                                                                                                Е                                                К

4.      Хорды .                                                                                                       

                                                                                                                                       S                                                T

                                                                                                                              H                  

                                                                                                                                                    F              A                      

Используя рисунок (рисунок не выполняй!) выпиши:

1.      Радиусы                                                                                      X               M                       N                         

2.     

О

 Диаметры                                                                                            С                                      Д

3.     

•  ООOO

Касательные                                                                                                Е                                                К

4.      Хорды                                                                                                         

                                                                                                                                       S                                                T

                                                                                                                              H                  

                                                                                                                                                    F              A                       

Используя рисунок (рисунок не выполняй!) выпиши:

1.      Радиусы                                                                                      X               M                       N                         

2.     

О

 Диаметры                                                                                            С                                      Д

3.     

•  ООOO

Касательные                                                                                                Е                                                К

4.      Хорды                                                                                                         

                                                                                                                                       S                                                T

                                                                                                                              H                  

                                                                                                                                                    F              A                      

Тест: укажи номера верных

Утверждений:

1.                       Окружность-кривая замкнутая линия

2.                       Радиус – отрезок, соединяющий центр с точкой окружность .

3.                       Центральный угол измеряется половиной дуги, на которую он опирается.

4.                       Центральный угол измеряется дугой, на которую он опирается.

5.                       Вписанный угол измеряется дугой, на которую он опирается.

6.                       Вписанный угол измеряется половиной дуги, на которую он опирается.

7.                       Диаметр-это самая большая хорда.

8.                       Дуга окружности равна 360⁰.

Ответ(писать номера верных предложений)

Используя рисунок (рисунок не выполняй!) выпиши:

1.      Радиусы                                                                                      X               M                       N                         

2.     

О

 Диаметры                                                                                            С                                      Д

3.     

•  ООOO

Касательные                                                                                                Е                                                К

4.      Хорды                                                                                                         

                                                                                                                                       S                                                T

                                                                                                                              H                  

                                                                                                                                                    F              A                      

30⁰

5.Найти величину  <AOB и <ДОА на рисунке:                                                    А                   

О

                                                                                                       Д                                             В

6.Найти величину вписанного угла АСВ на рисунке:                                                             С 

                                                                                                                                                                               В

                                                                                                                                        А

                                                                                                                                                                146⁰

7,Найти величину дуги АВ, если вписанный угол равен 71⁰:               С

71⁰

     

                                                                                                        А                                          В 

Решение задач по теме: «Окружность»

1. Четырёхугольник АВСД вписан в окружность. Угол АВД равен 75⁰, угол САД равен 35⁰.

Найдите угол АВС.

                             В                С

                  А                                 Д

2.Найдите угол АСД, если его сторона СА касается окружности, а дуга АД окружности,

заключённая внутри этого угла, равна 116⁰.

                                                             А                           С

                                                                           В

О

О

                                      Д

                    3.3,

3. Какой угол  (в градусах) образуют минутная и часовая стрелки часов в 5 часов?

 4.Какой угол образует минутная стрелка за 10 минут?                                                                                              3.

                                                                                                     4.

5. Четырёхугольник АВСД вписан в окружность. Угол АВС равен 110⁰, угол АВД равен 70⁰.

Найдите угол САД.

                             В                С

                   А                                 Д