How to convert an angle (x) in degrees to radian?
In a circle, 2 radians equals 360 degree. * One radian equals 180 degree. * degree equals (1/180)radian. * So, x degrees equals (x/180) radian.
If a man is standing on his head, how many degrees does he need for standing upright?
Tempted to guess 90 degrees, but the answer is quite different. He needs 90+90 i.e 180 degrees.
What is the solution of: −8 < x + 11
Answer: -8 - 11 < x + 11 - 11 i.e. -19 < x