Its 19 mm. 19 mm is roughly 0.75 inches which is the width of a penny
False it is not similar same thing
Change the fractions into decimals first.
If the decimal is for example 1.56565656... and so on, it is repeating. Because as you can see, the number 56 is repeating. If the decimal is for example 1.456 and there is no number afterwards, means that it is terminating.
Π=180º
Cos(19π/6)=cos(19*180º/6)=cos (570º)=cos(210º+360º)=cos(210º)=
=-cos 30º=-√3 / 2≈-0.866...
Answer: cos(19π/6)=-cos 30º=-√3/2
