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3 years ago

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If the area of a circle measures 25π cm2, what is the circumference of the circle in terms of π? A) 5π cm B) 10π cm C) 50π cm D)

100π cm

2 answers:

Bad White [126]3 years ago

8 0

the answer to the question is a.) 5rr cm because 5rr is right on brainly i've had it

Sliva [168]3 years ago

6 0

<h2><em><u>Answer:</u></em></h2><h2><em><u>The correct answer is B) 10 pi cm</u></em></h2><h2><em><u>Step-by-step explanation:</u></em></h2><h2><em><u>10π cm </u></em></h2><h2><em><u /></em></h2><h2><em><u>A = πr2 </u></em></h2><h2><em><u>25π = πr2 </u></em></h2><h2><em><u>25 = r2 </u></em></h2><h2><em><u>5 = r </u></em></h2><h2><em><u /></em></h2><h2><em><u>C = 2πr </u></em></h2><h2><em><u>C = 2π(5) </u></em></h2><h2><em><u>C = 10π</u></em></h2>

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3 years ago

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Step-by-step explanation:

The shape of an arch corresponds to a parabola.

the general equation for a parabola is:

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we're given three coordinates: (-7,-13),(7,-13) and (0,0)

so we can plug these values in the general equation to make 3 separate equations:

(x,y) = (-7,-13)

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(x,y) = (7,-13)

$-13=a(7)^2+b(7)+c$

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we've already found c = 0, let's use substitute it to other equations.

$49a-7b+c=-13\quad\Rightarrow\quad49a-7b=-13$

$49a+7b+c=-13\quad\Rightarrow\quad49a+7b=-13$

we can solve these two equation using the elimination method, by simply adding the two equations

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------------------------------

$\quad\quad 98a=-26$

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$49a-7b=-13$

$49\left(-\dfrac{13}{49}\right)-7b=-13$

$-13-7b=-13$

$-7b=0$

$b=0$

We have the values of a,b, and c. We can plug them in the general equation to find the equation of the arch.

$y=\left(-\dfrac{13}{49}\right)x^2+0x+0$

$y=-\dfrac{13}{49}x^2$

$49y=-13x^2$

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3 years ago

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Answer

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