The area of a circle is 78.5 square meters. what is the radius ?

Mathematics

2 answers:

Rina8888 [55]3 years ago

7 0

The radius will be = 5

Nataly [62]3 years ago

3 0

$\bf \textit{area of a circle}\\\\
A=\pi r^2\quad 
\begin{cases}
r=radius\\
------\\\
A=78.5
\end{cases}\implies 78.5=\pi r^2\implies \cfrac{78.5}{\pi }=r^2
\\\\\\
\sqrt{\cfrac{78.5}{\pi }}=r$

You might be interested in

The probability that an archer hits a target on a given shot is .7 if five shots are fired find the probability that the archer

VikaD [51]

This is a problem in "binomial probability." Either the archer hits his target or he does not. This experiment is performed 5 times (so that n=5), and the probability that the archer will hit the target is 0.7 (so that p=0.7).

We need to find the binomial probability that x=3 when the possible outcomes are {0, 1, 2, 3, 4, 5}.

You could use a table of binomial probabilities to evaluate the following:

P(5, 0.7, 3).

Alternatively, you could use a TI-83 or TI-84 calculator and its built-in "binompdf( " function.

I evaluated binompdf(5,0.7,3) and obtained the result 0.309.

5 0

3 years ago

Help me on this please

Vitek1552 [10]

Right triangle = Pythagoras theorem.
a^2+b^2=c^2
there's already c and b so
10^2-8^2=a^2
100-64= 36
a^2=36
square root both sides
to get 6.

5 0

3 years ago

The average value of a function f over the interval [−2,3] is −6 , and the average value of f over the interval [3,5] is 20. Wha

Xelga [282]

Answer:

The average value of $f$ over the interval $[-2,5]$ is $\frac{10}{7}$ .