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rjkz [21]
3 years ago
12

the area of a circle is 81 pi m^2. what is the circumference, in meters? express your answer in terms of pi.

Mathematics
1 answer:
mestny [16]3 years ago
8 0
<h3>Answer:    18pi</h3>

============================================================

Explanation:

The area 81pi square meters leads to the radius 9 meters

Use the formula A = pi*r^2 to see why this is the case. You plug in A = 81pi and solve for r to get r = 9.

-----------------

Once you know the radius, you can determine the circumference C

C = 2*pi*r

C = 2*pi*9

C = 2*9*pi

C = 18pi

The circumference is the perimeter, or distance, around the circle.

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The diameter of a circle is 6 m. Find its area in terms of π π.
Xelga [282]

Step-by-step explanation:

this is totally simple.

the formula for the area of a circle (as you can find with any search on the internet in seconds) :

A = pi×r²

r is the radius.

and once you understand even the most basics of a circle, you know that the radius is half of the diameter.

so, in our case, r = 6/2 = 3 m

the area of the circle is therefore

pi×r² = pi×3² = pi×9 m²

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2 years ago
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Answer:

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3 years ago
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Zielflug [23.3K]

Answer: The probability is zero.

Step-by-step explanation:

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To solve this problem, we first have to create a system of equations. After that, you set the equations equal to each other, and use that to simplify and find the value of one variable. Once that is found that answer can be plugged into one of the two original equations to find the other variable.

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2 years ago
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