2 years ago

What is the length of AC? 3 ft 4 ft 9 ft 18 ft

1 answer:

8 0

Ok so we know that the length of BN and NC are the same, so BC should be 6, and BM and MA are the same so BA should be 8. Using ratios, we can use either 3/6=9/x or 4/8=9/x. Using either equations the answer u would get is 18.

The length of AC is 18

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If A+B= 45° then prove that: tanA+ tanB+ tanA. tanB

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Answer:

See Explanation

Step-by-step explanation:

$A+B= 45 \degree \\ \\ assuming \: \tan \: on \: both \: sides \\ \\\implies \: \tan( A+B)= \tan 45 \degree \\ \\ \implies \: \tan( A+B)= 1 \: \: \\ ( \because \: \tan 45 \degree = 1) \\ \\ \implies \: \frac{\tan \: A +\tan \: B }{1 - \tan \: A .\tan \: B } = 1 \\ \\ \implies \: \tan \: A +\tan \: B = 1 - \tan \: A .\tan \: B \\ \\ \purple{ \implies }\: \orange{ \bold{\tan \: A +\tan \: B + \tan \: A .\tan \: B= 1 }} \\ \\ thus \: proved$