ARI IICENTRE DE GREUTATE Cat egoria i denumirea f igurii Prof ilul f iguriiAria f iguriiPoziia centrului de greutate Trapez oarecare bGOahcd1d2 A =( o + b) 2 A =J1J2 sino2 xu=o2 + b2 + 2oc + ob + bc3( o + b) yu =( 2o + b)3( o + b) Triunghi oarecare orient atdupa o ax baGOch A =o2;A =ob sino2xu=o + c3; yu =3 Triunghi oarecare GOABCbac A = s( s o) ( s b) ( s c)s =o + b + c2 xu =xA + xB + xC3 yu =yA + yB + yC3 Triunghi drept unghic baGO A =ob2xu=o3 ; yu =b3 Triunghi isoscel baGOhbO A =o4 4b2 o2 xu=o2 ;yu=3 Cerc R G=OL A = nR2; I = 2nRxu= 0; yu= 0 Semicerc RGO A =nR22 xu=4R3n ;yu= 0 Sect or de cerc GORL A =nR2360 2o;I =nR180 2o xu=23 Rsinoo [ roJ] ; yu = 0 Segmentde cerc GORAB A =nR2360 2o A0ABxu=43 Rsin3o2o sin2o; yu = 0 Sect or de coroan circularGORr A =n( R2 r2)3602oxu=23 R3 r3R2 r2 ; yu = 0 Jumtate de elips abGO A =n2ob2xu=4o3n; yu = 0 Parabol de gradul I IbaGO A =ob3xu=o4 ; yu =3b10 Parabol de gradul I IbaGO A =2ob3xu=3o8; yu =2b5 Parabol de gradul I IaGOb A =2ob3xu=o2 ; yu =2b5 Parabol de gradul I I IbaGO A =ob4xu=o5 ; yu =b3