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3 years ago

6

How do you find the circumference of a circle??

2 answers:

Phoenix [80]3 years ago

4 0

Answer:

how do you find the circumference of a circle??

C=2πr

C=2πr

Alexxx [7]3 years ago

4 0

Answer:C=2πr

Step-by-step explanation: yww

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3 years ago

Choose all the zeros of the quadratic function defined by the expression 2x2 + 5x - 12

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4 years ago

Keiko, Dale, and Jose have a total of $107 in their wallets. Jose has 3 times what Dale has. Keiko has $8 less than Dale. How mu

olga2289 [7]

Answer:

Amount in Dale's wallet :$23

Amount in Keiko's wallet :$15

Amount in Jose's wallet: $69

Step-by-step explanation:

Let the money in Dale's wallet be $X

Given Jose has 3 times money than what Dale has.

if Dale has $X then Jose has $3X.

Also Keiko has $8 less than Dale

if Dale has $X then Keiko has $X - $8

Also Keiko, Dale, and Jose have a total of $107 in their wallets.

Writing this in form of mathematical expression with their value of money in terms of X we have given below equation.

$X + $3X + $X - $8 = $107

=> $5X - $8 = $107

=> $5X = $107 + $8 = $115

=> X = $115/5 = $23.

Amount in Dale's wallet = $X = $23

Amount in Keiko's wallet = $X - $8 = $23 - $8 =$15

Amount in Jose's wallet = $3X = $3*23 = $69

6 0

3 years ago

.....................................................

Nesterboy [21]

(a) The perimeter of the shape is the sum of half a circumference and the diameter itself.

The circumference of a circle with radius $r$ is $2\pi r$ , and since $d=2r$ we can write the circumference as

$C=\pi d$

So, half a circumference is

$\dfrac{C}{2}=\dfrac{\pi d}{2}$

Ad we get the perimeter by addind the diameter:

$P=\dfrac{\pi d}{2}+d$

(b) Given the perimeter, we can solve for $d$ :

$51.42=\dfrac{\pi d}{2}+d=d\left(\dfrac{\pi}{2}+1\right)$

So, we can divide both sides by the parenthesis and we have

$d=\dfrac{51.42}{\frac{\pi}{2}+1}=\dfrac{51.42}{2.571}=20$

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3 years ago