I am in cs50 please use C programming (printf scanf etc) 

Please Write Source code and Output. Attached are the Questions.

Remember to mark problems clearly & obvious in your PDF and show both the source code and output, you can watch a video about this in the Modules doc which explains the format for turning in work, how to make a PDF, etc.. You don't have to include my problem text in your pdf, just label the problem and put your source code and your output. Do that for every problem. If there are multiple problems in the assignment you can put all of them in one pdf. You should watch my video- its in the Modules doc on how to turn on the hw xoxo. Sometimes you can find hint docs floating around in the Class Notes on similar problems, use the class notes as a resource xoxo Part 1 CircleArea You are going to write a program to compute and output the area of a circle with a radius of 2.5. Think through what you need to do: Create a variable for radius set it to 2.5 Create a variable for area set it to 3.14159 * radius * radius output the value of area Make sure to use existing constant for Pl, and use radius squared instead of radius * radius. Challenge Guard for bogus input