Question

What quadrant does the angle 2.2 lie in? (Unit circle)

Answer 1

We know that

using the approximation 
π≈3.14 radians
and
π/2≈1.57 radians  

Since 1.57 < 2.2 <3.14
we can write this inequality like this: 
π/2 <2.2 < π.
Since we know that π radians is equal to 180° and π/2 radians is equal to 90°,
2.2 radians lies in the second quadrant.