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hodyreva [135]
3 years ago
15

What is the radius of a circle with a circumference of 125.66 feet?

Mathematics
2 answers:
alukav5142 [94]3 years ago
3 0

Answer:

r = 19.9994101 ft

so about 20 feet

Step-by-step explanation:

Mademuasel [1]3 years ago
3 0

Answer:

19.9994101489

(I think oof)

Step-by-step explanation:

Formula for circumference is 2πr

125.66 divided by 2 is 62.83

62.83 divided by π is 19.9994101489

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Answer:  \bold{-\dfrac{161}{289}}

<u>Step-by-step explanation:</u>

Given: cos x = \dfrac{8}{17}, x is in Quadrant 4

Use Pythagorean Theorem to find sin x:

8² + y² = 17²    

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→    sin x = -\dfrac{15}{17}

Use the double angle formula to find cos (2x):

cos (2x) = cos^2 x - sin^2 x\\\\.\qquad=\bigg(\dfrac{8}{17}\bigg)^2-\bigg(-\dfrac{15}{17}\bigg)^2\\\\\\.\qquad=\dfrac{64}{289}-\dfrac{225}{289}\\\\\\.\qquad=-\dfrac{161}{289}

             

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