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umka21 [38]
3 years ago
7

The point (3, -4) is on the terminal side of an angle . What is cos ?

Mathematics
1 answer:
Kaylis [27]3 years ago
3 0
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
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