If the altitudes of a triangle be 2,4,6, then find its in-radius.

If length of altitudes of a triangle are 3,4 and 6 units then inradius of the triangle is,

If the altitude of an equilateral triangle is 6 units, then the radius of its incircle is ____________.

The areas of two similar triangles are 81 cm^(2) and 49 cm^(2) respectively . If the altitude of the triangle is 6.3 cm , find the corresponding altitude of the other.

If the height and base of a triangle are 6 cm and 5 cm respectively, and the area of the triangle is equal to a circle, then find its radius.

If the lengths of the sides of a triangle are in the ratio 4:5:6 and the inradius of the triangle is 3 cm, then the altitude of the triangle corresponding to the largest side as base is :

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

The areas of two similar triangle are 81 cm^(2) and 49 cm ^(2) respectively. If the altitude of the bigger triangle is 4.5 cm, find th corresponding altitude of the smaller triangle.