Question

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

Answer 1

Cos() = AC / AB

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

Answer 2

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