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AnnZ [28]
3 years ago
12

The formula for the circumference C of a circle, in terms of the radius, is C = 2TTr, where r stands for the radius. Rearrange t

he quantities in this formula to give a new formula for the radius of a circle in terms of the circumference.
Mathematics
1 answer:
asambeis [7]3 years ago
8 0
r = (C / π) / 2

Actually the formula of the circumference is Pi multiplied to diameter; where the diameter is equal to twice the radius.

C = π d
d = 2 r
C = π * 2r

If we need to find the radius from the Circumference then

r =  (C / π) / 2

You must differentiate Pi from the number 2 because 2 is part of the radius. This is also to avoid confusion.

For example:  r = 5 ; π - 3.14; find the circumference

C = π * 2r
C = 3.14 * (2*5)
C = 3.14 * 10
C = 31.40

If the circumference is given and the radius is missing, then,

r = (C/π) / 2
r = (31.4 / 3.14) / 2
r = 10 / 2
r = 5
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3 years ago
Lin and Han's families provide money for their school lunch
Julli [10]

Answer:

1) after 4 weeks, Lin has more with $65

2) after 3 weeks they both have same amount

Step-by-step explanation:

let 'w' = number of weeks

1) <u>equation for Han</u>:  y = 100 - 15w

y = 100 - 15(4)

y = 100 - 60

y = $40 after 4 weeks

<u>equation for Linn</u>:  y = 25 + 10w

y = 25 + 10(4)

y = 25 + 40

y = $65 after 4 weeks

2) 100 - 15w = 25 + 10w

    75 - 15w = 10w

    75 = 25w

     w = 3 weeks

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3 years ago
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Elli has some money
STALIN [3.7K]
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Square root of 21 and square root of 62. must be given into 1 decimal place
blsea [12.9K]

Answer:

square root of 21 is 4.6

square root of 62 is 7.9

Step-by-step explanation:

square root of 21 is 4.6

square root of 62 is 7.9

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