Предмет: Геометрия, автор: xex1237

найдите сторону или угол обозначенные знаком вопроса. объясните свой ответ

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Ответы

Автор ответа: zmeura1204
1

Ответ:

∠KBC=61°

Объяснение:

∠ABD+∠DBC=180°, смежные углы.

∠DBC=180°-∠ABD=180°-58°=122°

BK- высота, медиана треугольника ∆DBC.

∆DBC- равнобедренный треугольник.

ВК- биссектриса угла ∠DBC.

∠DBK=∠KBC.

∠KBC=∠DBC/2=122°/2=61°

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xex1237: спасибо большое)
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Контрольный срез для 8 класса ( 2 полугодие)
Student _________________________________________ Mark____________Variant 1
Task 1. Put in the modals: Can/Could/May/Must/Can’t/Should
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3. I’m sorry, I …………………... go home.
4. You ………………….. see a doctor as soon as possible.
5. Students …………………….smoke at college.
6. My little brother …………………. read very well.
Task 2. Open the brackets and write the correct form of the comparative or superlative adjective:
1. My Mom is …………………………………... (short) of all her sisters.
2. Cheetah is ………………………………………..(fast) animal in the world.
3. He is ………………………………………(clever) than his brother.
4. It’s ……………………………………. (far) than my house.
5. She is …………………………………………….(intelligent) girl I have ever met.
6. These shoes are …………………………………………….(expensive) than those ones.
Task 3. Make the sentences negative:
1. It was raining. __________________________________________________________________
2. She can type very fast. ____________________________________________________________
3. We wanted to go away.___________________________________________________________
4. My parents have travelled to 12 countries.____________________________________________
5. Jack goes to the gym every day._____________________________________________________
6. He’ll leave his job in a year.________________________________________________________