What is the equation of a circle with center (2, -5) and radius 4?

2 answers:

8 0

$Equation\ of\ circle\\\\\
r^2=(x-a)^2+(y-b)^2\\\\
a,b- \ coordinates\ of\ center\ of\ circle\\\\\
(a,b)=(2,-5)
\\\\ r-\ radius\\\\
r=4\\\\Solution:\ 4^2=(x-2)^2+(y+5)^2\\\\\

$

Anna35 [415]4 years ago

4 0

$(x-h)^2+(y-k)^2=r^2\\\\
(x-2)^2+(y+5)^2=16$

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Use common denominators to determine whether the ratios form a proportion.

AURORKA [14]

They are not in proportion, since its 6:9 round it down (2:3) so pretend the 6 are apples and the 9 are oranges

Every 2 apples there are 3 oranges

So having 9 apples what is that?

2 x ? = 9

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So if you want to keep 2:3 you have you times the oranges by 4.5 aswell!

3 x 4.5 = 13.5

So since it is 9:12 not 9:13.5 they are not in proportion

7 0

4 years ago

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