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3 years ago

Work out the area of this circle

Mathematics

2 answers:

MaRussiya [10]3 years ago

4 0

Area of a circle = pi * r^2

Pi = 3.142
r = 4

A = 3.142 (4*4)
A = 3.142 * 16
A = 50.272 cm^2

DIA [1.3K]3 years ago

3 0

Answer:

50.24 or 50.272

Step-by-step explanation:

Square radius and then times by 3.14 or 3.142

4^2*3.14 = 50.24

4^2*3.142 = 50.272

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What divided by 2 equals -12

Elenna [48]

The answer would be -6

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3 years ago

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Ede4ka [16]

The explicit formula for given sequence is: $a_n = -1 . (-4)^{n-1}$

Step-by-step explanation:

Given sequence is:

-1,4,-16,64.....

We can see that there is no same difference between consecutive terms so we will find common ratio to see if it is a geometric sequence.

Here

$a_1 = -1\\a_2 = 4\\a_3 = -16\\a_4 = 64\\r = \frac{a_2}{a_1} = \frac{4}{-1} = -4\\r = \frac{a_3}{a_2} = \frac{-16}{4} = -4$

The explicit formula for geometric sequence is:

$a_n = a_1r^{n-1}$

Putting the values of r and a1

$a_n = -1 . (-4)^{n-1}$

Hence

The explicit formula for given sequence is: $a_n = -1 . (-4)^{n-1}$

Keywords: Geometric sequence, common ratio

Learn more about geometric sequence at:

#learnwithBrainly

5 0

4 years ago

Find the area of a circle with the circumference 18(pi)

JulsSmile [24]

Answer:

D 81 pi units^2

Step-by-step explanation:

The circumference of a circle is given by

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Divide each side by 2 * pi

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9 = r

Now we can find the area. Area is given by

A = pi r^2

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A = 81 pi units^2

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3 years ago

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anygoal [31]

Answer:

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Step-by-step explanation:

Apply the square root function to both sides of the equation:

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likoan [24]

Answer:

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Step-by-step explanation:

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