You can rotate a picture on your iPhone by 90 degrees or at a custom angle. Here's how to do it in a few simple steps.

Let’s find out the time after making the 90 degrees anticlockwise rotation. The current time showing in the clock is 3:35. The hour hand which is at 3, will move back at 12 and the minute hand which ...

We are fond of saying things are symmetric, but what does that really mean? Intuitively we have a sense of symmetry as a kind of mirroring. Suppose we draw a vertical line through the middle of a ...