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2 years ago

The equation for the circle below is the x2 + y2=81. what is the length of the circles radius

Mathematics

2 answers:

larisa [96]2 years ago

8 0

Answer:

Step-by-step explanation:

Compare your x2 + y2=81 to the following:

x^2 + y^2 = 81

The " ^ " symbol indicates exponentiation.

Now compare x^2 + y^2 = 81 to

x^2 + y^2 = r^2.

This is the standard equation of a circle of radius r centered at the origin, (0,0). You can see for yourself that 81 must equal r^2.

Taking the square root of 81, we get plus or minus 9.

But the radius must be positive, so we reject the -9 and take +9.

The radius is 9.

SSSSS [86.1K]2 years ago

8 0

Answer: 9

Step-by-step explanation:

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