Diagram Of A 35mm Camera What Is The Radius Of The Diagram's Larger Circle In The Area Of The Shaded Region Is 72П ?

What is the radius of the diagram's larger circle in the area of the shaded region is 72П ? - diagram of a 35mm camera

What is the radius of the large circle in the chart area of the shaded region is 72П?

the picture is a circle that is gray ... in this circle is a white circle with a radius of 3