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The point (3, -4) is on the terminal side of an angle . What is cos ?
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Jul 14, 2018
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The point (3, -4) is on the terminal side of an angle . What is cos ?
Mathematics
high-school
Mobie
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Cos angle = adj/hyp
3 is the adj, -4 is the opposite, so use Pythagorean theorem to find the hypotenuse.
3^2 + (-4)^2 = c^2
9 + 16 = c^2
25 = c^2
5 = hyp
Cos angle = 3/5
To find angle use cos^-1
Cos^-1 (3/5) = angle
Angle =
53.1 degrees
Alperen
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Jul 21, 2018
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Alperen
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