Half angle formulae| Area of triangle inradius| Circumradius and exradii

Half angle formula||Centres OF triangle

Half angle formulae || Area OF Δ and circumradius

In an equilateral triangle, inradius r , circumradius R and ex-radius r_1 are in A.P. (b) G.P. (c) H.P. (d) none of these

In an equilateral triangle, the inradius, circumradius, and one of the exradii are in the ratio

In an equilateral triangle, the inradius, circumradius, and one of the exradii are in the ratio 2:4:5 (b) 1:2:3 (c) 1:2:4 (d) 2:4:3

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

Ratio of inradius to circumradius in triangle

Formulas for Circumradius

In a right angled isoceles triangle,the ratio of the circumradius and inradius is

In a right - angled isosceles triangle , the ratio of the circumradius and inradius is