Three shapes

1/5 of a circle is shaded. The ratio of area if square to the sum of area of rectangle and that of the circle is 1:2. 60% of the square is shaded and 1/3 of the rectangle is shaded. What is the ratio of the area of circle to that of the rectangle?

Result

C =  0.333

Solution:


R = 1
R/3+C/5 = 0.60 S
2S = C+R

R = 1
3C+5R-9S = 0
C+R-2S = 0

C = 13 ≈ 0.333333
R = 1
S = 23 ≈ 0.666667

Calculated by our linear equations calculator.



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