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KonstantinChe [14]
3 years ago
7

What is the area of a circle if the diameter is 6 centimeters?

Mathematics
2 answers:
Klio2033 [76]3 years ago
6 0

Answer:

18pi or 56.52 if you substitute pi with 3.14

Step-by-step explanation:

Dima020 [189]3 years ago
6 0

Answer:

28.26 {cm}^{2}

Step-by-step explanation:

First let's find the radius

d = 2r \\ 6 = 2r \\  \frac{6}{2}  =  \frac{2r}{2}  \\ 3 = r

Now let's find the area.

\pi {r}^{2}  \\ 3.14  \times 3 \times 3 \\  = 28.26 {cm}^{2}

hope this helps

brainliest appreciated

good luck !have a nice day

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Solve the equation 5x-2x^2+1
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Answer:

Step-by-step explanation:

If you call "5x-2x^2+1" an "equation," then you must equate 5x-2x^2+1 to 0:

5x-2x^2+1 = 0

This is a quadratic equation.  Rearranging the terms in descending order by powers of x, we get:

-2x^2 + 5x + 1 = 0.  Here the coefficients are a = -2, b = 5 and c = 1.

Use the quadratic formula to solve for x:

First find the discriminant, b^2 - 4ac:  25 - 4(-2)(1) = 25 + 8 = 33

Because the discriminant is positive, the roots of this quadratic are real and unequal.

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Applying the quadratic formula   x = --------------------------------

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we get:

      -5 ± √33           -5 + √33

x = ----------------- = --------------------- and

           2(-2)                     -4

                                  -5 - √33

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

                                         -4

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3 years ago
Please answer it if it is true i will make you the brainliest.
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