What is sin of a 30-degree angle on the unit circle?
On the unit circle, every point's coordinates are (cos, sin). Learn a few landmarks and the special angles are solved.
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1 lesson for “The unit circle”
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How much does one apple cost?
Ben paid $2.40 for 3 apples and divided 3 by 2.40, getting 1.25. He computed apples per dollar instead of dollars per apple.
Try this lessonWhy does “because it's true” get circled?
Every sentence in the paragraph is true, and the paragraph still does not argue anything. What is missing is the sentence that links the evidence to the claim.
Try this lessonWhy is a mole not a weight?
A dozen is 12. A mole is 6.02 x 10^23. Practice dividing particle counts by Avogadro's number, and learn why the mole is not a weight.
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