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kari74 [83]
3 years ago
7

Johnny's drink coaster has a radius of 4 inches. what is the coasters diameter

Mathematics
1 answer:
GREYUIT [131]3 years ago
7 0

Answer:

the coaster diameter is 8

<h2>diameter=2r</h2><h3> d=4+4 #d=8</h3>
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<span>Center:(-4,6)
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And in our particular case:
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(x+4)2+(y-6)2=82
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General Form

The general form for the equation of a circle is
x2 + y2 + Ax + By + c = 0
We can get the general form by expanding the equation of the standard form
(x-a)2+(y-b)2=r2
(x--4)2+(y-6)2=82
(x+4)2+(y-6)2=64
x2+8x+16+y2-12y+36=64
x2+y2+8x-12y-12=0


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