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nadya68 [22]
3 years ago
9

Find the area of a circle with the circumference 18(pi)

Mathematics
2 answers:
jek_recluse [69]3 years ago
8 0

Circumference = 2\pi r

\frac{18\pi}{2\pi} = \frac{2\pi r }{2\pi }

18 ÷ 2 = 9

r = 9

-----------------------------------------------------------------------------------------------------------------

Area = \pi r^{2}

= \pi (9)^{2}

= 81\pi units².

JulsSmile [24]3 years ago
5 0

Answer:

D 81 pi units^2

Step-by-step explanation:

The circumference of a circle  is given by

C = 2 * pi *r

18 pi = 2 * pi *r

Divide each side by 2 * pi

18 pi / (2 pi) = 2 pi * r/ (2 pi)

9 = r

Now we can find the area.  Area is given by

A = pi r^2

A = pi * 9^2

A = 81 pi units^2

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You can find the segment congruent to AC by finding another segment with the same length. So first, you need to find the length of AC.

   C - A = AC
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Now, find another segment that also has a length of 6.

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7 0
3 years ago
Lee has $1.75 in dimes and nickels. The number of nickels is 11 more than the number of dimes. How many of each coin does he hav
Schach [20]

Answer:

Lee has 19 nickels and 8 dimes

Step-by-step explanation:

hello, I think I can help you with this

Step 1

Let

value of a nickel=$0.05

value of a dime=$0.10

number of nickels=N

number of nickels=D

According to the question data Lee has $1.75 in dimes and nickels.

0.05N+0.1D=1.75,equation(1)

also, the number of nickels is 11 more than the number of dimes.mathematical speaking

N=11+D,equation(2)

Step 2

replace N from equation (2) into equation (1)

0.05N+0.1D=1.75

0.05(11+D)+0.1D=1.75

Now, solve for D

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0.15D=1.75-0.55

D=1.2/0.15

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Step 3

replace the value of D into equation(2) to obtain N

N=11+8

N=11+8

N=19

Hence, Lee has 19 nickels and 8 dimes

Have a great day.

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3 years ago
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