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Mashutka [201]
3 years ago
8

A regular pentagon is shown. What is the measure of the radius, c, rounded to the nearest hundredth? Use an appropriate trigonom

etric ratio to solve.

Mathematics
2 answers:
OlgaM077 [116]3 years ago
5 0
The angle at the center opposite side b must be 

\theta = \dfrac 1 2 \cdot  \dfrac{360^\circ}{5} = 36^\circ

\cos \theta = \dfrac{10}{c}

c = \dfrac{10}{\cos 36^\circ} = 12.36

Did you know the cosine of 36^\circ was half the Golden Ratio? We can actually get an exact answer for this one.

c =\dfrac{10}{\frac 1 4 (1+\sqrt 5)} = 10(\sqrt 5 - 1)



valentinak56 [21]3 years ago
3 0

Answer:12.36

Step-by-step explanation:

just did it

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Dawn has to pay 10,990 for her college dorm room and tuition each year. About how much money does dawn spend the first 2 years of college

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If line A contains Q(5,1) and is parallel to line MN with M(-2,4) and N(2,1), which ordered pair would be on the perpendicular t
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Your question does not say what were your options, therefore I will answer generically: in order to understand if a point (ordered pair) is contained in a line, you need to substitute the x-component of the pair in the equation of the line and see if the calculations give you the y-component of the pair.

Example:
Your line is <span> y = 4/3x + 1/3
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y = 4/3·2 + 1/3 = 9/3 = 3
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Solve for t <br> 64= -8(t+85)
erastova [34]

Answer: t = -93

Step-by-step explanation:

64= -8(t+85)

64= -8t - 680

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Molly drew a blue line that was 19 1/12 inches long. Then she drew a green line that was
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Answer:

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Step-by-step explanation:

<u>Subtract the values:</u>

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