For an angular displacement greater than 15 degrees why is it not considered an SHM?

Q.

What is an angle called if it is greater than 90 degrees, but less than 180 degrees?

Q. A simple pendulum with a bob of mass m swings with an angular amplitude of ${40}^0$. When its angular displacement is ${20}^0$, the tension in the string greater than $mgcos{20}^0$.

Q. A particle performing circular motion has an angular displacement of 90 degrees. What is its corresponding linear displacement. The radius of the circle described is 10 cms

Q. An object rotates by an angle of 90 degrees in 4 secs. Find the angular displacement in radians

Q. An angle whose measure is greater than $90$ degree and less than $180$ degree is called ____