The circumference of a circle is 6 pi cm. What is the area of circle

Mathematics

2 answers:

AURORKA [14]3 years ago

6 0

Answer:

A = 9 pi cm^2

Step-by-step explanation:

Circumference = 2 * pi *r

6pi = 2 * pi *r

Divide each side by pi

6 = 2r

Divide by 2

6/2 = 2r/2

3=r

Now we want to find the area

A = pi r^2

A = pi (3)^2

A = 9 pi cm^2

kati45 [8]3 years ago

6 0

Answer: $28.27cm^2$

Step-by-step explanation:

The area of a circle can be calculated with the formula:

$A=\pi r^2$

Where r is the radius of the circle.

The circumference of a circle can be calculated with the formula:

$C=2\pi r$

Where r is the radius of the circle.

Knowing that the circumference is 6π, you know that the radius is:

$r=\frac{6\pi}{2\pi}\\r=3cm$

Substitute the radius of the circle into the formula $A=\pi r^2$ , then:

$A=\pi (3cm)^2\\A=28.27cm^2$

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I am a number greater than 40,000 and less than 60,000:

40,000 < n < 60,000

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n = 10,000n₁ + 1,000n₂ + 100n₃ + 11n₄

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0 ≤ n₄ ≤ 9

My ten thousands digit is 1 less than 3 times the sum of my ones digit and tens digit:

n₁ = 3*2n₄ - 1

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This means that:

n = 10,000*(6n₄-1) + 1,000n₂ + 100n₃ + 11n₄

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My thousands digit is half my hundreds digit, and the sum of those two digits is 9:

n₂ = 1/2 * n₃

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Therefore:

n₂ = 9 - n₃

Therefore:

9 - n₃ = 1/2 * n₃

9 = 1/2 * n₃ + n₃

9 = 1.5 * n₃

Therefore:

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This means that:

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3 years ago

Help with math earn 10 points

Luda [366]

Answer:

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Step-by-step explanation:

We want to know what x is going to equal that makes the equation the same.

First, I make the euations equal to each other by substituting the y -->

7x + 50 = 10x + 5

Then, I combine my similar terms --> 45 = 3x

After that, I divide by 3 to get x on its own --> $\frac{45}{3} =\frac{3x}{3}$ --> 15 = x