In a `Delta ABC, 2s=` perimeter and R = circumradius. Then, find `s/R.`

If in DeltaABC CosB=3/5 , AB=5 and R=5 ( R is circumradius). then find area of Delta

If in a Delta ABC, AD, BE and CF are the altitudes and R is the circumradius, then find the radius of the DEF.

Let A(0,-1,1),B(0,0,1),C(1,0,1) are the vertices of a Delta ABC. If R and r denotes the circumradius and inradius of Delta ABC, then (r)/(R) has value equal to

If in a Delta ABC,AD,BE and CF are the altitudes and R is the circumradius,then the radius of the circumcircle of Delta DEF is

Two sides of triangle ABC are 5 and 12. Area of DeltaABC=30 Find 2R+r where R is circumradius and r is inradius.

In triangle ABC, let angle C = pi//2 . If r is the inradius and R is circumradius of the triangle, then 2(r + R) is equal to