knightc904
15.01.2020 •
Mathematics
The formula for the surface area of a sphere is a = 4tr2.
which equation correctly solves the equation for r?
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Ответ:
Ответ:
Graph the point to form a right triangle. The point lies in quadrant 4. Cosine is positive in quadrant 4.
3^2 + (-4)^2 = c^2
25 = c^2
Taking the square root on both sides leads to c = 5.
c = 5 = hypotenuse
Adjacent = 3
cos θ = adjacent/hypotenuse
cos θ = 3/5
Done!