Respuesta :

Answer:

Step-by-step explanation:

let angle [tex]B[/tex] . be [tex]y[/tex]   then,

using angle sum property,

x+y+90=180 (angle c is 90 because its given)

hence you have the equation

Answer:

Cos() = AC / AB

So in this case: Cos() = 5 / 13

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