Question

Which equation can be used to find the measure of angle BAC?

Answer 1

Answer:

Step-by-step explanation:

let angle $B$ . be $y$   then,

using angle sum property,

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

hence you have the equation

Answer 2

Answer:

Cos() = AC / AB

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