The lengths of the three sides of a triangle (not necessarily a right triangle) are 2.21 meters, 6.59 meters and 4.47 meters. What is the cosine of the angle opposite the side of length 4.47 meters? cos theta=?

Question

anonymous · Answer

first you make a sketch 
triangle 
the theta is the angle opposite the side of length 4.47 meters
cosign means adjacent/hypotenuse
hypotenuse is the longest side which is the 6.59 m
then the adj is 2.21
the formula would be
cosign theta = adjacent over the hypotenuse
cosign theta = 2.21/ 6.59
((in scientific calculator )theta = cosign^-1 (2.21/6.59)
theta= 70.41 degree