baniyaanu83 baniyaanu83

23-10-2021
Mathematics

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

prove cos a 513 pls solve it and no link pls class=

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IRobert IRobert

23-10-2021

Answer : The demonstration is below :)

Step-by-step explanation :

We use Pythagoras' theorem :

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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