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(30/360*pi*x^2)-(1/2ab sin30)=5
(1/12pi*X^2)-(1/2*X*X*0.5)=5
PiX^2-3X^2=60
x^2(pi-3)=60
x^2(pi-3)/(pi-3)=60/pi-3
x^2=60/pi-3
Then you find square root on both side
X=square root of (60/pi-3)
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