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3 years ago

If the area of a circle measures 25π cm2, what is the circumference of the circle in terms of π?

2 answers:

5 0

Two formulas here:

Area = πr²

Circumference = 2<span>πr

So first we solve for r from area:

25</span>π = πr²

25 = r²

r = 5

So we know that radius is 5 cm.

Now substitute r to 5 in circumference formula:

C = 2π(5) = 10π

Final answer: 10π cm

Hope this helps.

zhannawk [14.2K]3 years ago

5 0

Answer:

10 $\pi$ cm

Step-by-step explanation:

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Answer:

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Step-by-step explanation:

one and two

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2 years ago

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3 years ago

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2 years ago

For waht values of x do the vectors -1,0,-1), (2,1,2), (1,1, x) form a basis for R3?

DaniilM [7]

<h2>Answer:</h2>

The values of x for which the given vectors are basis for R³ is:

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<h2>Step-by-step explanation:</h2>

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We are given three vectors as:

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The matrix formed by these vectors is:

$\left[\begin{array}{ccc}-1&2&1\\0&1&1\\-1&2&x\end{array}\right]$

Now, the determinant of this matrix is:

$\begin{vmatrix}-1 &2 & 1\\ 0& 1 & 1\\ -1 & 2 & x\end{vmatrix}=-1(x-2)-2(1)+1\\\\\\\begin{vmatrix}-1 &2 & 1\\ 0& 1 & 1\\ -1 & 2 & x\end{vmatrix}=-x+2-2+1\\\\\\\begin{vmatrix}-1 &2 & 1\\ 0& 1 & 1\\ -1 & 2 & x\end{vmatrix}=-x+1$

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3 years ago

14. Ginny has 26 tests to correct. It takes her

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Answer:

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Step-by-step explanation:

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2 years ago

Read 2 more answers