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Aflati aria unui sector de cerc daca a) R= 5 cm, n = 30


Răspuns :

Asector cerc=[tex] \pi [/tex][tex] R^{2} [/tex]xn°/360°=[tex] \pi [/tex]25x30°/360°
A=25[tex] \pi [/tex]/12
A = π·r²·n/360 = π·25·30/360 = 2,08(3)·π cm²