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givi [52]
3 years ago
10

The area of a circle is 81pie square feet. What is the length of the radius? What is the length of the diameter? Please show ste

ps!
Mathematics
2 answers:
Elanso [62]3 years ago
6 0

A=81\pi \\A=\pi r^2 \\81\pi=\pi r^2\Longrightarrow r^2=81radius=\sqrt{81}=\boxed{9} \\diameter=2radius = 2\cdot9=\boxed{18}

Anna35 [415]3 years ago
3 0

\bf \textit{area of a circle}\\\\ A=\pi r^2~~ \begin{cases} r=radius\\[-0.5em] \hrulefill\\ A=81\pi \end{cases}\implies 81\pi =\pi r^2\implies \cfrac{81\pi }{\pi }=r^2\implies 81=r^2 \\\\\\ \sqrt{81}=r\implies \boxed{9=r}~\hspace{10em}\stackrel{\textit{diameter = twice the radius}}{18}

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given a data set of 33 unique whole number observation,its five number sumary is [16, 29, 40 ,54, 67]

Step-by-step explanation:

The p-th percentile in an ordered (from low to high) data set is a value such that p% of the data is less than that value. The quartiles of a data set are the 25th, 50th and 75th percentiles. (The 25th percentile is usually called the first quartile, the 50th percentile is usually called the median, and the 75th percentile is usually called the third quartile.)

The formula for finding the location (or position) of the (approximate) pth percentile in an ordered (from low to high) data set is  

L p=(n+1).p/100

For example, in the data set  [2,4,6,8,10,12,14,16,18]

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L 60=(9+1).60/100=6

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3 years ago
What is the value of x which proves that the runways are parallel? What is the measure of the larger angle?
makkiz [27]

Answer:

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Step-by-step explanation:

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Therefore the measure of the largest angle is 118°.

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