If `A=c(a^(2)+b^(2))`, then which of the following is/are true?

If the integers a,b,c,d are in A.P a

If A=(d)/(2)(a+b) , then which of the following is/are true?

If A=(d)/(2)(a+b) , then which of the following is/are true?

In a triangle ABC (with usual notations), (sin A+sin B)sin C=(a.b)/(2R^(2)) ,then which of the following are always true-

If p^(2) (a^(2) +b^(2) +c^(2)) -2p (ab +bc +cd) +(b^(2) +c^(2) +d^(2)) le 0 then which of the following statement is true?

ABCD is a cyclic quadrilateral and A + B = 2 ( C + D) . If angle C gt 30^(@) , then which of the following is true

Consider three observations a, b and c such that b=a+c. If the standard deviation of a+2, b+2, c+2 is d, then which of the following is true ?

In Delta ABC, AB=c cm, AC = b cm and CB = a cm . If /_ A = 2 /_ B , then which of the following is true ?