21 trillion in scientific notation?
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B. 90/360, because this is 1/4 from circle. It's even shown in the picture.
Example: If you take a protractor at 180°, then if you mirror it, then 360° will comeout, i.e. a circle.
Example: If you take a protractor at 180°, then if you mirror it, then 360° will comeout, i.e. a circle.