95 is 50% of what number

The length of an intercepted arc of a central angle of a circle is 4 cm. if the radius of the circle is 5 cm what is the measurement of the central angle to the nearest whole degree

Can anyone explain to me how to do this? anything will .

Sharina simplified the expression 3(2x – 6 – x + 1)2 – 2 + 4x. in step 1 she simplified within the parentheses. in step 2 she expanded the exponent.which is a possible next step