Consider the following for the next two items that follow:
A hall is of length l, breadth b and height h. The maximum distance between any two points (say P and Q) inside the hall is 14 m, whereas the maximum distance between two points (say P and R) on the floor is 6√5 m
If α is the angle between the line joining P and Q, and the line joining P and R, then what is cos α equal to?
3√5/7
Using the given information and trigonometric relations, cos α is found to be 3√5/7. Therefore, the correct answer is (b).
If x² + y² + z² = 3, where x, y and z are integers, then how many values can (xy + yz + zx) have?
Find the co-ordinates of the centroid of a triangle whose vertices are A(1, 4), B(7, 8) and C(10, 12).