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3 years ago

The circumference of a circle is 25π cm. What is the area, in square centimeters? Express your answer in terms of \piπ.

Mathematics

2 answers:

creativ13 [48]3 years ago

5 0

Answer:

A = 156.25 pi cm^2

Step-by-step explanation:

The circumference of a circle is given by

C = 2 * pi *r

25 pi = 2 * pi *r

Divide each side by 2 pi

25 pi/2 pi = 2 pi r / 2 pi

12.5 = r

We can find the area by

A = pi r^2

A = pi ( 12.5) ^2

A = 156.25 pi cm^2

marissa [1.9K]3 years ago

4 0

Other guy is correct

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3 years ago

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horrorfan [7]

Answer:

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Step-by-step explanation:

| x-a| ≥ b

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3 years ago

What's the ratio if you have 3.5 to 17

lukranit [14]

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3 0

3 years ago

Write an equation of the line that passes through(2,7) and (0,-5)

SVETLANKA909090 [29]

Answer:

$-6x + y = -5\:or\:y = 6x - 5$

Step-by-step explanation:

First, find the rate of change [slope]:

$\frac{-y_1 + y_2}{-x_1 + x_2} = m$

$\frac{-7 - 5}{-2 ± 0} = \frac{-12}{-2} = 6$

Then plug these coordinates into the Slope-Intercept Formula instead of the Point-Slope Formula because you get it done much swiftly. In this case, we have a y-intercept of $[0, -5]$ , so this is a giveaway. It does not matter which ordered pair you choose:

$-5 = b \\ \\ y = 6x - 5$

If you want it in Standard Form:

y = 6x - 5

- 6x - 6x

_________

$-6x + y = -5$

_______________________________________________

7 = 6[2] + b

$-5 = b \\ \\ y = 6x - 5$

y = 6x - 5

- 6x - 6x

_________

$-6x + y = -5$

** You see? I told you it did not matter which ordered pair you choose because you will always get the exact same result.

I am joyous to assist you anytime.

5 0

4 years ago

Triangle XYZ is reflected across the y-axis, and X = (4, –5). What are the coordinates of X’ ?

Nina [5.8K]

The coordinates of X would be X'(-4, -5).

The equation would be P(x,y) -> P'(-x, y) so you would make the x-coordinate a negative number and keep the y-coordinate the same.

3 0

3 years ago

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