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sertanlavr [38]
4 years ago
5

I need help Could someone help me please

Mathematics
1 answer:
Alinara [238K]4 years ago
4 0

Answer:

cos A = \frac{5}{13}

Step-by-step explanation:

cos A = \frac{adjacent}{hypotenuse}

To calculate the hypotenuse AB use Pythagoras' identity

AB² = 15² + 36² = 225 + 1296 = 1521, hence

AB = \sqrt{1521} = 39

hence cos A = \frac{15}{39} = \frac{5}{13} in simplest form



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