Question

what is an area of a circle if the sircles r=8ft

Answer 1

area of circle with radius r is
\(\large A =\pi r^2\)

Answer 2

whats thats thing to the left of the r?

Answer 3

its \(\large \pi=3.14... or \: \: 22/7\)

Answer 4

so, A = 3.14 *r^2
r=8
A = 3.14 * 8^2 =... ?

Answer 5

25.12?

Answer 6

i get A = 3.14*64 = 201.06 ft^2.

Answer 7

what if the ratio is 20?

Answer 8

ratio or radius ?

Answer 9

same as the last one area andc the r=20

Answer 10

r=20
so
A = 3.14 *20^2 = 3.14 *400 =... ?

Answer 11

1256

Answer 12

thats correct area.

Answer 13

hmm well and if d=12?

Answer 14

d is the diameter which is half of radius
so, r = d/2 = 12/2 = 6
now again same formula for area
A =3.14 *6^2 = ... ?

Answer 15

113

Answer 16

that is also correct :)

Answer 17

and if d=100

Answer 18

how would you find r ?

Answer 19

3.14* it

Answer 20

so itd be 31400

Answer 21

from d which is the diameter , r is half of d
so, r= d/2 =100/2 =50
now calculate A.

Answer 22

huh? :O

Answer 23

whenever d = diameter is given, to get radius, divide it by 2.

Answer 24

so itd be 6?

Answer 25

6 ?
if d = 100, r= 50

Answer 26

dikkk what do i do?

Answer 27

d= 100, right ?
then r=50
A = 3.14 * r^2 = 3.14 * 50* 50 =... ?

Answer 28

452.16

Answer 29

i get something else.

Answer 30

well thats when you do 3.14*12^2 and then when i did the other part i got 7850

Answer 31

i too got 7850

Answer 32

it was wrong

Answer 33

for d=100, A comes out to be 7850...do u want accurate answers ?

Answer 34

7853.98

Answer 35

noo it wasnt on the tes \t so i had to click none of the above it was wrong ):

Answer 36

did u understand how to solve such problems ?

Answer 37

yea.

Answer 38

good, that is more important :)
that you understand....
any more problems ?

Answer 39

im dojng a tutorial atm but theyll be more i have till januray 18th to finish up this school year. and in math im 62 percent so i have a lot of tests

Answer 40

well, best of luck :)