Question

One circular table has a diameter of 9 ft, and another circular table has a diameter of 20 ft. How much greater is the area of the larger table? Round to the nearest whole number.

Answer 1

What is the radius of each of the 2 circles? (divide diameter by 2)

Answer 2

10 and 4.5

Answer 3

about 251 ft2
about 146 ft2
about 336 ft2
about 1,002 ft2
theses are the answer choices

Answer 4

So first to find area of circle, what do u do?

Answer 5

What is the equation for area of a circle? Divide the diameter by 2 to find the radius. Plug into the equation. Subtract the 2 areas (1 for each circle)

Answer 6

100pi-20.25pi

Answer 7

use a calc for that.

Answer 8

You need to use the following equations:

Area of circle = 2*pi*(r^2)
radius, r = diameter/2

Plug in the given values and subtract the smaller table's area from the larger table's area.

It is about 251ft^2.

Answer 9

Area = 1/4 (PI * d²)

Answer 10

not 1/4

Answer 11

8. A team in science class placed a chalk mark on the side of a wheel and rolled the wheel in a straight line until the chalk mark returned to the same position. The team then measured the distance the wheel had rolled and found it to be 35 cm. To the nearest tenth, what is the area of the wheel?

27.5 cm2
97.5 cm2
195.1 cm2
390.1 cm2
this question i asked earlier

Answer 12

thank youuu i tried itt .

Answer 13

9² = 81
20² = 400

PI * 81 = 254.4690049408
PI * 400 = 1,256.6370614359

Difference = 1002.1680564952

Answer 14

NO. those are using the diameters.
its radius squared.

Answer 15

CLASSIC MISTAKE!!!

Answer 16

David
Circle Area = PI * r² = 1/4 * (PI * d²)

Answer 17

OH GOSH. just do it ez way ok?

Answer 18

i got the first answer already what abt 8 im stuck /:

Answer 19

about question 8 i put *

Answer 20

Okay - anyway the answer is 1,002
Okay now for question 8

Answer 21

so the 1st questioni s 1,002 ft2 not 251 ft2

Answer 22

35 cm = wheel circumference
wheel diameter = 35/PI = 11.1408460164
wheel area = 1/4 PI*d²
area = 389.9296105751

Answer 23

Yes first answer is 1,002 - look at my work

Answer 24

yea i see
thank you

Answer 25

u r welcome
and I think I answered question 8 properly too

Answer 26

35 cm ?

Answer 27

area = 390

Answer 28

OR if you use PI = 22/7 then area = 390.086557023

Answer 29

Incidentally, I believe the record for computing PI is over a trillion digits!!!
That's why I don't like using 22/7. Heck can't we at least keep it accurate to 3.14159?
LOL

Answer 30

lol are you a math teacher ?

Answer 31

No - just someone who was good at math when I was in school a long time ago.

Answer 32

60 cm
30 cm
90 cm
120 cm
what about this question ?

Answer 33

The circumference of a circle is 60π cm. What is the radius of the circle?

Answer 34

circ = 60*PI cm
diam = circum / PI = 60
radius = 30cm

Answer 35

thank you wolf

Answer 36

u r welcome

Answer 37

When BA = 10 ft, find the area of the region that is NOT shaded. Round to the nearest whole number.

262 ft2
43 ft2
305 ft2
52 ft2
https://wcps6429-millbrookhs-ccl.gradpoint.com/Resource/3750901,780,111,0,0,0,0/Assets/testitemimages/geometry_b/area/mc114-1.jpg

Answer 38

last one

Answer 39

Wow - just surfing the Internet just got back

Answer 40

BA=10 radius = 10
area of entire circle = PI*r²
= 314.159
area of 60° sector = 60/360 * 314.159
= 52.35983
Area of shaded area (called a segment) = 9.0586
Area = Sector Area 52.35983 MINUS Segment Area 9.0586
Area = 43.301

To find segment area try this calculator: (yeah my website)
http://www.1728.org/circsect.htm
To figure out segment area you'll have to go here:
http://www.1728.org/circpart.htm
Hope that helps.