Can someone please help me with my Geometry homework please?

Please use the following image below to solve the question:
Find the measure of the red arc or angle.
What is the measure/degree of PS?(The symbol is in the the image)

Please show all the work on how you got your answer.

 arc PS = 80°

Step-by-step explanation:

Arc PS is shown as being intercepted by the inscribed angle PRS, which is marked as 40°. The measure of the intercepted arc is twice the measure of the inscribed angle:

  arc PS = 2×40°

  arc PS = 80°

the mistake in the pattern is that :

b. the decimal point was moved one too many place values each time

the correct pattern could be made by :

b. moving the decimal point to the right the same numbers of place values as the exponents

step-by-step explanation:

the shape,the size and the distance