@eidosm 👍👌👍
r = 18+x
r^2 = (12+18)^2+x^2
324+x^2+36x = 900+x^2
36x = (900-324)
x = 16
raggio r = 16+18 = 34 cm
area rossa = 34^2/2 = 578 u^2
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