Question

How do you convert -630 degrees to radian?

Answer 1

`-3.5pirad`

Explanation:

To convert degrees to radians, multiply by `1/1` in radians over degrees:
`(2pi)/360` (Each measure is equal to a full circle).
`-630*(2pi)/360=-3.5pirad`

Answer 2

A circle is `360` degrees, also known as `2pi` radians. So `-630^circ` is

`-630^circ times {2 pi}/{360^circ} = -{7 pi}/2` radians.

Explanation:

It's an absurd system designed to confuse students when `-7/4` of a circle is `-7/2` of the circle constant.