The circum-centre of a triangle ABC is O. If ∠BAC = 85o, ∠BCA = 75o, then ∠OAC is of
If a2 + 13b2 + c2 - 4ab - 6bc = 0, then a:b:c is
If x2 - xy + y2 =2 and x4 + x2y2 + y4 = 6, then the value of x2 + xy + y2 is:
The average of 20 numbers is calculated as 35. It is discovered later on that while calculating the average, one number, namely 85, was read as 45. The correct average is
The difference between two numbers is 9 and the difference between their squares is 207. The numbers are
Which of the following relations is correct for
