Question

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Charlie measured the circle-shaped part of a sun his sister drew on the chalkboard.

The circumference of the circle is 75.36 cm. What is the diameter? (Use 3.14 for .)

Answer 1

do you know the formula ??

Answer 2

no

Answer 3

\[\huge\rm C = \pi \times d\]
C =circumference
d = diameter
replace variables by their values and solve or missing variable

Answer 4

for*

Answer 5

i dont get it

Answer 6

circumference of the circle is what ??

Answer 7

3.14?

Answer 8

nope read the question again

Answer 9

o 75.36 sorry

Answer 10

C= 75.36
pi = ??
d = ??
you have to solve for d
so replace pi and c by their values

Answer 11

pi is 3.14?

Answer 12

yep right

Answer 13

so it is pi times the ....um diameter

Answer 14

c = pi times diameter
how would you substitute ??

Answer 15

i dont kno a variable?

Answer 16

okay that's right but i'm saying how would equation look like when you replace c and pi
by their values

Answer 17

o 75.36 = 3.14 * d

Answer 18

yep right
so how would you solve for d?
do you know ??

Answer 19

no i dont

Answer 20

3.14 is multiplying by d
do cancel out 3.14 from right side you should do opposite of multiply which is ?

Answer 21

divide

Answer 22

yep right so divide both side by 3.14

Answer 23

24 and 1

Answer 24

yep right
d times 1 = d

Answer 25

so it is 24? rite

Answer 26

yes

Answer 27

wait but this guy said 36 r6 2 = 6 how did he get 6?

Answer 28

r^2*

Answer 29

36 times r^2 = 6 ??

Answer 30

yes that is wvat he said

Answer 31

2 times 36 times r^2 ??
write one more time i don't get that

Answer 32

he said that 36= r^2 and so radius =6

Answer 33

is that a same question or different ?

Answer 34

different

Answer 35

okay so r = d/2
radius is half of diameter
r^2 = 36 <--- how would you solve this for r ??

Answer 36

um 36/2?

Answer 37

nope
r^2 = 36 this one

Answer 38

you have to take square root both side

Answer 39

square root?

Answer 40

yep
you can change square root to exponent \[\huge\rm \sqrt[n]{x^m} = x^\frac{ m }{ n }\]