sin(θ+180∘)=−sinθcos(θ+180∘)=−cosθtan(θ+180∘)=tanθsin(θ+π)=−sinθcos(θ+π)=−cosθtan(θ+π)=tanθ

If I compare them, I will get π=180∘. Why? Isn’t π=3.142…? Can anyone prove this?

**Answer**

Not π but π radians equal 180°

**Attribution***Source : Link , Question Author : Chin Huan , Answer Author : Leox*