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AURORKA [14]
3 years ago
13

Find the surface area of a sphere with a radius of 8cm

Mathematics
1 answer:
Andreas93 [3]3 years ago
3 0
I believe the proper way to find the surface area of a sphere is 4 times 3.14 (which is Pi) times the radius squared. Or 4(3.14)*r^2.

Where I found 804.25
You might be interested in
Estimate the product of 45.67and 1.42​
Montano1993 [528]

Answer:

The estimate is about 47

Step-by-step explanation:

45.67 ~ 45.5

1.42 ~ 1.5

1.5 + 45.5 = 47

7 0
2 years ago
Help please..............
arsen [322]
Looks good to me. Calculation is correct.  Although you might want to add to #1 your description; that the width of the rectangle is the circumference of the circle (w = 2πr) and that you add the surfaces together to get the total surface area.
total surface area = area of rectangular part + area of circular parts
SA = 2πrL + 2πr²

7 0
3 years ago
The area of a rectangle is 14 m2 , and the length of the rectangle is 3 m less than double the width. find the dimensions of the
muminat
Width =3.5, length = 4

Let's make a few equations to summarize what we know.:
a = 14
l = 2w -3
a = wl

Now let's substitute the expression for l into the expression for area and solve.
a = w(2w - 3)
a = 2w^2 - 3w
14 = 2w^2 - 3w

0 = 2w^2 - 3w - 14

which factors into
(2w - 7) (w + 2)

Solving for w
2w - 7 = 0
2w = 7
w = 3.5

w+2 = 0
w = -2

So w can be either 3.5 or -2. Since a negative width doesn't make sense, w = 3.5

Let's verify
w = 3.5
l = 2w - 3
l = 2*3.5 - 3
l = 7 - 3
l = 4
a = wl
a = 3.5 * 4
a = 14

So the width is 3.5 and the length is 4.

3 0
3 years ago
The number 18 is which % of 15
Anuta_ua [19.1K]
It would be: 18/15 * 100 = 1800/15 = 120%
3 0
3 years ago
Write 171 miles in 3 hours as a unit rate
Andrew [12]
Mph is what you are going for

so 171/3 = 57

57mph is your answer

hope this helps
3 0
3 years ago
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