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Colloquially, it means to give it a one quarter turn. Imagine taking a dial that currently points upwards, and rotating it to point rightward. That is a 90° rotation. Similarly, the amount by which the minute hand in an analog clock moves in fifteen minutes should be 90°.

If you are looking to do this mathematically, the easiest way is to use a rotation matrix. In this case, you are rotating around the point 0, 0.

Q: What does it mean to rotate an object to 90 degrees?

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turn one quarter of the way.

{1 0} {0 -1}

It is symmetric, so the rotation would be useless, it would still look the same.

Imagine a clock: a circle is 360 degrees, so every 5 minutes is 30 degrees. If you started at 1pm and rotated it 90 degrees it would be 1.15pm

You have to switch the x and y coordinates and multiply your new x coordinate by -1. You can also dram the point and rotate your paper physically by 90 degrees. Example: Your Coordinates: (3,8) New Coordinates: (-8,3) (3,8) ---> (8,3) ---> (-8,3) Another Ex: (-7,-1) --> (-1,-7) --> (1,-7)

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turn one quarter of the way.

rotate it 90 degrees

If its 2d, you need a point of rotation If its 3d, you need an axis of rotation

It rotates 90 degrees.

Yes

yes

Uranus is the planet that is tilted 90 degrees on its side, causing it to rotate on its side as it orbits the Sun. This unique tilt is thought to be the result of a collision with a massive object early in its formation.

The text will rotate 90 degrees to the right. The beginning of the text will be at the top. If you rotate another 90 degrees, the text will display upside down.

A quarter turn is 90 degrees. This is based on a full circle of 360 degrees.

Yes

you open it with a picture editor, rotate it 90 degrees and save it.

It goes right round 360 degrees in 24 hours, so 6 hours for 90 degrees, relative to the Sun. Relative to the distant stars, it takes the Earth about 5 hours, 59 minutes to rotate 90 degrees.