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

Statement I In a Delta ABC, if a lt b lt c and ri si inradius and r_(1), r_(2) ,r_(3) are the exradii opposite to angle A,B,C respectively, then r lt r_(1) lt r_(2) lt r_(3). Statement II For, DeltaABC r_(1)r_(2)+r_(2)r_(3)+r_(3)r_(1)=(r_(1)r_(2)r_(3))/(r)

In DeltaABC, let b=6, c=10and r_(1) =r_(2)+r_(3)+r then find area of Delta ABC.

Find the circumcentre and circumradius of the triangle whose vertices are (-2, 3), (2, -1) and (4, 0).

In Delta ABC , P, Q and R are the midpoints of AB, BC and CA respectively. If PQ = 5 cm, QR = 8 cm and RP = 6.5 cm, find the perimeter of Delta ABC .

A(0, 0), ,.B (-36, 15) and C(20, 15) are the verticies of Delta ABC . Find centroid, incentre, circum centre and ortho centre of Delta ABC .

In any Delta ABC, prove the following : r_1=rcot(B/2)cot(C/2)

In Delta ABC , M and N are the midpoints of AB and AC respectively. If AB = 8 cm, AC = 7 cm and MN = 4.5 cm, find the perimeter of Delta ABC .

In Delta ABC , D, E and F are the midpoints of AB, BC and CA respectively. If AB = 6 cm, BC = 7.2 cm and CA= 7.8, find the perimeter of DeltaDEF

An isosceles triangle has perimeter 30 cm and each of the equal sides is 12 cm. Find the area of the triangle.

In Delta ABC , AB = 20 cm, BC = 21 cm and the perimeter of Delta ABC = 70 cm. Find the area of Delta ABC using Heron's formula.