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3 years ago

What is the area of a circle with a radius of 40 cm? cm² (Use 3.14 for Pi.)

Mathematics

1 answer:

Travka [436]3 years ago

4 0

Answer:5024 cm^2

Step-by-step explanation:

Formula for area of a circle =πr^2

Where π=3.14, r=40cm

Area=3.14*40^2

=3.14*1600

=5024cm^2

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ipn [44]

The answer is -5

Explanation:

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-6 + 12 -11=
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3 years ago

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Give me equations that will equal to 16.. it can also b solving for x

STatiana [176]

It is a very simple answer but it works!

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3 years ago

A circle is inscribed in a square is 10 inch sides what is the circumference of the circle use 3.14 as an approximation for pie

MissTica

Answer:

31.4 inches

Step-by-step explanation:

If a circle is inscribed in a square then diameter of circle inscribed is same as side as of square.

In the given problem it is given that side of square is 10 inches.

So diameter of circle inscribed is 10 inches

we know radius of circle is half of diameter of circle

Thus, radius of circle inscribed = diameter of circle/2 = 10/2 = 5inches.

Expression to calculate circumference of circle is given by $2\pi r$

where r is the radius of circle.

Thus circumference of circle inscribed is

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Thus, circumference of circle inscribed is 31.4 inches

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3 years ago

Which pairs of rectangles are similar polygons?

kobusy [5.1K]

the longer side / the shorter side must be the same for rectangles to be similar.

For A: 105 / 80 = 1.32

For B: 120 / 90 = 1.33

For C: 100 / 75 = 1.47

So... only A and B are similar.

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3 years ago

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What are the coordinates of the turning point for the function f(x) = (x - 1)3 - 3? A. (-1, -3)

Naddik [55]

ANSWER

The turning point is

$(1,-3).$

EXPLANATION

The function given to us is

$f(x) = (x - 1) ^{3} - 3$

At turning point,
$f '(x) = 0$

So we need to differentiate the given function and equate it to zero.

We using the chain rule of differentiation, we obtain,
$f '(x) =3 (x - 1) ^{2}$

We equate this to zero to obtain,

$3 (x - 1) ^{2} = 0$

We divide through by 3.

$(x - 1) ^{2} = 0$

We solve for x to get,

$x - 1 = 0$

$x = 1$

We substitute this x-value in to the function to obtain the corresponding y-value of the turning point.

$f(1) = (1- 1) ^{3} - 3$

$f(1) = 0 - 3$

$f(1) = - 3$

Therefore the turning point is

$(1,-3)$

C is the correct answer.

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3 years ago

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