If `r:R:r_1 = 2:5:12`, then `A=`

In A B C , if r\ : r_1: R=2\ : 12\ :5, where all symbols have their usual meaning, then A B C is an acute angled triangle A B C is an obtuse angled triangle A B C is right angled which is not isosceles A B C is isosceles which is not right angled

In a !ABC if r_(1) = 8, r_(2) = 12 and r_(3) = 24, then a =

In a !ABC if r_(1) = 36 , r_(2) = 18 and r_(3) = 12 , then the area of the triangle , in square units, is

In a !ABC if r_(1) = 36 , r_(2) = 18 and r_(3) = 12 , then the perimeter of the triangle , is

det [[r + 4,63, r + 3]] = det [[5, r + 2r + 5,4]] ^ (T) then r =

If ""^(12)C_(5) =^(12)C_(r) then r=_____

If a relation R on the set {1,2,3} be defined by R={(1,2)}, then R is:

If ""^(11)P_(r )= ""^(12)P_(r-1) , then r = ………….