If `|r|<1,` then the sum of infinite terms of G.P is

If r_(1)^(2)=r_1r_(2)+r_(2)r_(3)+r_(3)r_(1) then the triangle is

If nger , then ""^(r)C_(r)+""^(r+1)C_(r)+""^(r+2)C_(r)+......+""^(n)C_(r) is equal to

If nger , then ""^(r)C_(r)+""^(r+1)C_(r)+""^(r+2)C_(r)+......+""^(n)C_(r) is equal to

Formula OF R || r || r1 r2 and r3 with ProOF

If (r)/(r_(2))=(r_(1))/(r_(3)) then

If r/(r_1)=(r_2)/(r_3), then

If r/(r_(1))=(r_(2))/(r_(3)) , then

If r_(1),r_(2),r_(3),r are in usual notation in Delta ABC then r_(1)r_(2)r_(3)-r(r_(1)r_(2)+r_(2)r_(3)+r_(3)r_(1))=

If r_1 , r_2 , r_3 are the radii of the escribed circles of a Delta ABC and if r is the in radius then r_1r_2r_3-r( r_1r_2+r_2r_3+r_3r_1)

If r_(1),r_(3),r_(1) are the radii of the escribed circles of a DeltaABC and if r is the radius of its incircle then r_(1)r_(2)r_(3)-r(r_(1)r_(2)+r_(2)r_(3)+r_(3)r_(1))=