Предмет: Геометрия, автор: pupil9090

2. Розв'яжи задачу за рисунком та умовою.
пж срочно​ срочно только с поясненям

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Ответы

Автор ответа: LN330068
1

Ответ:

Треугольник АВО равнобедренный,т к АО=ОВ,как радиусы
углы при основании равнобедренного треугольника равны между собой

<АВО=<А=40 градусов,тогда

<АОВ=180-40•2=100 градусов

<АОВ+<ВОС=180 градусов,как смежные

<ВОС=180-100=80 градусов

Касательная ВС к окружности и радиус ОВ образуют прямой угол

<ОВС=90 градусов

<ВСА=180-(90+80)=10 градусов

Объяснение:

pupil9090: спс
Автор ответа: ludmilaksenija2005
1

Объяснение:

касательная к окружности перпендикулярна радиусу проведённому в точку касания, значит ∠ОВС=90°.

∠А=∠АВО=40° ,т к ∆АОВ - равнобедреный:

(АО=ВО - как радиусы).

∠АВС=∠АВО+∠ОВС=40+90=130°

сумма углов треугольника равна 180°:

∠ВСА=180-∠АВС-∠А=180-130-40=10°

pupil9090: спс
arsenijbrizickij2: Людмила помогите с геометрией
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a. easy-going b. sociable c. shy

2. I am very good ……English.

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a. earthquake b. tornado c. hurricane

6. Big factories are responsible for water ……….

a. collection b. pollution c. Avalanche.

7. Computers had a huge .........on the 20th century.

a. impact b. download c. connect

8. You should play……..than yesterday.

a. the most carefully b. more carefully c. carefullier

9. He swims ……..than the Canadian sportsman.

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