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1 year ago

14

Từ điểm A ở ngoài (O) kẻ các tiếp tuyến AB, AC với đường tròn (B và C là các tiếp điểm), BC cắt OA tại D, trên cung nhỏ BC lấy E

, ED cắt (O) tại F chứng minh góc BAE = góc CAF

1 answer:

Neko [114]1 year ago

4 0

I don’t understand what is that

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Answer:

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Step-by-step explanation:

Consider all options:

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B. False, because

$(a^2-b^2)(c^2+d^2)=a^2c^2+a^2d^2-b^2c^2-b^2d^2\\ \\(ac-bd)^2-(ad+bc)^2=a^2c^2-2abcd+b^2d^2+a^2d^2+2abcd+b^2c^2=\\=a^2c^2+b^2d^2+a^2d^2+b^2c^2\\ \\a^2c^2+a^2d^2-b^2c^2-b^2d^2\neq a^2c^2+b^2d^2+a^2d^2+b^2c^2$

C. False, because

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D. True, because

$(a^2+b^2)(c^2+d^2)=a^2c^2+a^2d^2+b^2c^2+b^2d^2\\ \\(ac-bd)^2-(ad+bc)^2=a^2c^2-2abcd+b^2d^2+a^2d^2+2abcd+b^2c^2=\\=a^2c^2+b^2d^2+a^2d^2+b^2c^2\\ \\a^2c^2+a^2d^2+b^2c^2+b^2d^2= a^2c^2+b^2d^2+a^2d^2+b^2c^2$

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2 years ago

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PilotLPTM [1.2K]

3:45 I believe. You add 25 to 3:05 which gives you 3:30, then you add the 15 which gives you your answer

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2 years ago

Read 2 more answers

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UkoKoshka [18]

Answer:

Step-by-step explanation:

Increased amount = 3 - 2.50 = $ 0.50

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= 5 *4

= 20%

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2 years ago