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MariettaO [177]
3 years ago
10

Find the exact value of the area of a circle whose radius is 3.1

Mathematics
2 answers:
Kazeer [188]3 years ago
7 0

Answer:

Area = pi r²

Area = 22/7 × 3.1 × 3.1 = 30.202 unit²

GuDViN [60]3 years ago
4 0

Step-by-step explanation:

area \: of \: circle =  \pi \:  {r}^{2}  \\  = 3.14 \times  {(3.1)}^{2}  \\  = 3.14 \times 9.61 \\  = 30.1754 \:  {unit}^{2}  \\

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Answer:

You could just replace all the given possible values of k in the inequality and see which ones are solutions, but let's solve this in a more interesting way:

First, remember how the absolute value works:

IxI = x if x ≥ 0

IxI = -x if x ≤ 0

Then if we have something like:

IxI < B

We can rewrite this as

-B < x < B

Now let's answer the question, here we have the inequality:

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Then we can rewrite this as:

-18 < (-k - 2) < 18

Now let's isolate k:

first, we can add 2 in the 3 parts of the inequality:

-18 + 2 < -k - 2 + 2 < 18 + 2

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Now we can multiply all sides by -1, remember that this also changes the direction of the signs, then:

-1*-16 > -1*-k > -1*20

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Then k can be any value between these two limits.

So the correct options (from the given ones) are:

k = -16

k = -8

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