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That will depend on the length or angle of the arc which has not been given
There are 7 shaded blocks.
Area of sector: 38.485 sq ft Area of circle: 153.93804 sq ft Arc in degrees: (38.485/153.93804)*360 = 90.00114592 or about 90 degrees Arc in feet: 10.99557429 or about 11 feet
The unshaded region is 5/28ths of the rectangle.Shaded is 4/7 + 1/4 = 16/28 + 7/28 = 23/28
Yes it is cuz 7 and 45 have no common factors. 1x45=45, 5x9=45. 1x7=7