Question no. 2: we know that 30 degrees is not equivalent to 30 radians. Given the (already known) formula 1 Rule: To change radians to degrees, multiply by Rule #2 To change degrees to radians, multiply by 180 Find the radian values and enter them for 0, 30, 45, 60, 90, and 180 degrees in cells A8, A9, A10, All and A12, respectively.