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yawa3891 [41]
2 years ago
8

Prove cos a = 5/13 pls solve it and no link pls..........​

Mathematics
1 answer:
Scorpion4ik [409]2 years ago
3 0

<u>Answer</u> : The demonstration is below :)

Step-by-step explanation :

<u>We use Pythagoras' </u><u>theorem </u><u>:</u>

  • In the triangle ABC we have :

AB² = AC² - BC² = 15² - 9² = 144 = 12²

  • In the triangle ABD we have :

DB² = AD² - AB² = 13² - 12² = 5²

cos(a) = BD/AD = 5/13

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