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

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

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

In a Delta ABC,AD,BE and CF are three medians. The perimeter of Delta ABC is always.

In Delta ABC if AD is the altitude and O is the orthocentre of Delta ABC then AO:OD=

In an equilateral triangle,the in-radius and circumradius are in the ratio

In a scalene triangle ABC , AD and CF are the altitudes drawn from A and C on the sides BC and AB repectively.If the area of the triangle ABC and BDF are 18sq.units and 2 sq. units respectively and DF = 2sqrt2 , then R =

In A Delta ABC , AD ,BE and CF are three medians . The perimeter of Delta ABC is always

If AD,BE,CF are the altitudes of triangle ABC whose ortho centre is H then C is ortho centre of