3 years ago

Which answer choice shows 7.931 rounded to the nearest half?

2 answers:

Dimas [21]3 years ago

6 0

The Answer is C (which is 8)

5 0

The answer is C, I think if I’m wrong I’m sorry

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Alexus [3.1K]

D is the one that is decreasing

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Valentin [98]

<span>120 degs --> 1/3 of the circumference :) hope i helped!</span>

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USPshnik [31]

$\vec r(t)=2\cos t\,\vec\imath+2\sin t\,\vec\jmath+t\,\vec k$

$\implies\vec r'(t)=-2\sin t\,\vec\imath+2\cos t\,\vec\jmath+\vec k$

$\implies\|\vec r'(t)\|=\sqrt{(-2\sin t)^2+(2\cos t)^2+1^2}=\sqrt5$

Then the length of the arc is

$\displaystyle\int_0^{2\pi}\|\vec r'(t)\|\,\mathrm dt=\sqrt5\int_0^{2\pi}\mathrm dt=2\sqrt5\,\pi$

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Substitute the values into the equation

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