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3 years ago

What does πr² mean and how do I solve it

Mathematics

2 answers:

Licemer1 [7]3 years ago

8 0

That is circle area

A= $\pi * r^{2}$

r=circle radius
$\pi =$ 3.14

BlackZzzverrR [31]3 years ago

6 0

U do the radios first then what ever your anwser is u multipy it by 3.14

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Can someone help me? <br>

german

Step-by-step explanation:

p1=7

p2=10

p3=13

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2 years ago

What is the total perimeter of this figure in inches?

Tatiana [17]

The answer is 42 in
the equation is... 3+3+3+3+6+6+6+12=42in
hope this helps!

3 0

2 years ago

Read 2 more answers

X*+5X+6<br> please thanks

Katen [24]

Your answer is going to be 5x^2+6 because if you simplify and do x(5)x +6 it will equal to 5x^2 + 6

Hope this helped!!

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2 years ago

How many fluid ounces are in 3 quarts and 2 cups ?

sasho [114]

15 fluid ounces.
1quart= 4 cups

8 0

3 years ago

Read 2 more answers

Find the surface area of the surface given by the portion of the paraboloid z=3x2+3y2 that lies inside the cylinder x2+y2=4. (hi

natta225 [31]

Parameterize the part of the paraboloid within the cylinder - I'll call it $S$ - by

$\mathbf r(u,v)=\langle x(u,v),y(u,v),z(u,v)\rangle=\left\langle u\cos v,u\sin v,3u^2\right\rangle$

with $0\le u\le2$ and $0\le v\le2\pi$ . The region's area is given by the surface integral

$\displaystyle\iint_S\mathrm dS=\int_{u=0}^{u=2}\int_{v=0}^{v=2\pi}\|\mathbf r_u\times\mathbf r_v\|\,\mathrm du\,\mathrm dv$
$=\displaystyle\int_{v=0}^{v=2\pi}\int_{u=0}^{u=2}u\sqrt{1+36u^2}\,\mathrm du\,\mathrm dv$
$=\displaystyle2\pi\int_{u=0}^{u=2}u\sqrt{1+36u^2}\,\mathrm du$

Take $w=1+36u^2$ so that $\mathrm dw=72u\,\mathrm du$ , and the integral becomes

$=\displaystyle\frac{2\pi}{72}\int_{w=1}^{w=145}\sqrt w\,\mathrm dw$
$=\displaystyle\frac\pi{36}\frac23w^{3/2}\bigg|_{w=1}^{w=145}$
$=\dfrac\pi{54}(145^{3/2}-1)\approx101.522$

7 0

2 years ago