Explanation:
3pi / 10 * 180 / pi = 54 degrees.
The circumference of the circle would be 10 pi. Multiply this by 54/360 to get 1.5pi or 3 pi /2
Area of the circle would be 25 pi. Multiply this by 54/360 to get 3.75 pi or 15pi /4
I'm confused on part (c), is it not just the same question as part (b)?
All these answers are assuming that 3pi/10 is the central angle. If it is an inscribed angle, then the central angle would be 6pi/10 or 3pi/5.
Edit: if part (c) is talking about inscribed angle, then the degrees would be 108. Then you just multiply 25pi by 108/360 for your answer