The Area of the Non-blacked out area
Level
2
What is the area (in cm^2 and to the nearest integer) of the remaining non-blacked out area if the radius of the big circle is 28 cm?
2430 cm
1009 cm
1901 cm
4074 cm
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1 solution
The area of the big rectangle is 5 6 × 8 4 = 4 7 0 4 ,the area of the circles are ( 2 8 2 + 1 4 2 + 1 4 2 ) π = 1 1 7 6 π ,so the area is 4 7 0 4 − 1 1 7 6 π ≈ 1 0 0 9