A)
is right angled.
(p is the semiperimeter)
B)
Then, if
if
if
C)
(see A)
D)
In a triangle ABC if following relations hold good, in which of the case(s) the triangle is a right angled triangle?
A) r2 + r3 = r1 - r
B) a^2 + b^2 + c^2 = 8R^2
C) if the diameter of an excircle be equal to the perimeter of the triangle
D) 2R = r1 - r
Note: r - inradius
R - circumradius
1, 2 ,3 are subscripts denoting different inradiuses