To find cos(<BAC), we need to use the definition of cosine in a right triangle.
cos(<BAC) = adjacent side / hypotenuse
In this case, the adjacent side to angle <BAC is leg AC, which measures 4 units and the hypotenuse is AB, which measures 5 units.
Therefore, cos(<BAC) = 4 / 5 = 0.8
This figure is right triangle A B C, with right angle at vertex C. Leg A C measures 4 units. Leg B C measures 3 units. Hypotenuse A B measures 5 units.
Triangle ABC
is shown. What is cos(<BAC)
?
1 answer
1 answer