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jasenka [17]
2 years ago
10

If the diameter of a circular wall clock is 30 cm, what is the area of rhe clock?​

Mathematics
1 answer:
professor190 [17]2 years ago
6 0

Answer:

Step-by-step explanation:

radius=diameter/2

=30/2

=15 cm

area of a clock=πr^2

=3.14*(15)^2

=3.14*225

=706.5 cm^2

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The answer is 1/7 :)

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Write the equation of the circle with center (−1, −3) and (−7, −5) a point on the circle.
Pepsi [2]
So, we know the center is at -1, -3, hmmm what's the radius anyway?

well, the radius will be the distance from the center to any point on the circle, it just so happen that we know -7, -5 is on it, thus

\bf ~~~~~~~~~~~~\textit{distance between 2 points}\\\\
\begin{array}{ccccccccc}
&&x_1&&y_1&&x_2&&y_2\\
%  (a,b)
&&(~ -1 &,& -3~) 
%  (c,d)
&&(~ -7 &,& -5~)
\end{array}
\\\\\\
d = \sqrt{( x_2- x_1)^2 + ( y_2- y_1)^2}
\\\\\\
r=\sqrt{[-7-(-1)]^2+[-5-(-3)]^2}\implies r=\sqrt{(-7+1)^2+(-5+3)^2}
\\\\\\
r=\sqrt{36+4}\implies r=\sqrt{40}\\\\
-------------------------------

\bf \textit{equation of a circle}\\\\ 
(x- h)^2+(y- k)^2= r^2
\qquad 
center~~(\stackrel{-1}{ h},\stackrel{-3}{ k})\qquad \qquad 
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\\\\\\\
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5 0
3 years ago
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Answer:

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Step-by-step explanation:

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Subtract 3n from both sides
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20 po
Kobotan [32]

Answer:

Step-by-step explanation:

B

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