Answer: Option A; cos(28°) = 15/17
Step-by-step explanation:
You must remember that for a triangle rectangle we have that:
Sin( angle) = (opposite cathetus)/hypotenuse
cos(angle) = (adjacent cathetus)/hypotenuse
tan(angle) = (opposite cathetus)/(adjacent cathetus)
We want to find the cos(28°), then we can use the second relation, where the adjacent cathetus is 15 units long, and the hypotenuse is 17 units.
cos(28°) = 15/17
Then the correct option is A.
