What are three numbers that are greater than 543,000 but less than 544,000
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Check the picture below, you can pretty much count the units off the grid.
recall that the area of a triangle is A = (1/2)bh.
recall that the area of a triangle is A = (1/2)bh.
It's a value you should probably memorize:
You can derive it using some trigonometric identities, other known values of cosine, and properties of the cosine function. For example, using the double angle identity for cosine:
If , then
and you probably know that , so
When we take the square root, we should take the positive root because whenever
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