Answer:
The sine or sin is a trigonometric function of an angle. The sine of an acute angle is defined in the context of a right triangle: for the specified angle, it is the ratio of the length of the side that is opposite that angle, to the length of the longest side of the triangle (the hypotenuse).
Hope this helps you!
Explanation:
the answer is the last one
No but they are considered protected
Proxima Centauri is the nearest star to Earth.