pro đâu jup vs

T

tranvanduc93

Dau tien p goi tam jac ABC vuog taj A co AB=a BC=c AC=b
ap dung cog thuc dien tich tam jac ABC=ab/2=p*r(p la nua chu vi ,r la ban kinh duog tron noi tiep tam jac
tu do suy ra r=ab/(a+b+c)
mat # co R =c/2(tinh chat tam jac vuog)
tu do bieu thuc can c/m la: R+r=ab/(a+b+c)+c/2=(a+b)/2
quy dog dk 1 djeu luon dung la a^2+b^2=c^2
suy ra dpcm
 
You must log in or register to reply here.
Top Bottom