Which of the following pieces of data does NOT uniquely determine an acute-angled triangle `A B C(R` being the radius of the circumcircle)? `a ,sinA ,sinB` (b) `a , b , c ,` `a ,sinB ,R` (d) `a ,sinA ,R`

Which of the following pieces of data does not uniquely determine an acute-angled triangle ABC (R being the radius of the circumcircle)?

Which of the following pieces of data does NOT uniquely determine an acute-angled triangle ABC(R being the radius of the circumcircle)? a,sin A,sin B(b)a,b,c,a,sin B,R(d)a,sin A,R

If A and B are acute angles and sinA=cosB then A+B=

If the lengths of the sides of a right- angled triangle ABC, right angled at C, are in arithmetic progression, then the value of 5(sinA+sinB) is

Radius of circumcircle of /_\DEF is (A) R (B) R/2 (C) R/4 (D) none of these

If P is the circumcentre of an acute angled triangle ABC with circumredius R. D is the midpoint of BC. Show that the perimetre of triangleABC = 2R(sinA + sinB + sinC) .

Which of the following holds goods for any tiangle ABC, a,b,c are the lengths of the sides R is circumradius (A) (cosA)/a+(cosB)/b+(cosC)/c= (a^2+b^2+c^2)/(2abc) (B) (sinA)/a+(sinB)/b+(sinC)/c=3/(2R0 (C) (cosA)/a=(cosB)/b=(cosC)/c (D) (sin2A)/a62=(sin2B)/b^2=(sin2C)/c^2