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BARSIC [14]
3 years ago
15

Find the exact area of a circle having the given circumference. 3pi

Mathematics
1 answer:
Inessa [10]3 years ago
5 0

Answer:

A = (9/4)*pi units^2

Step-by-step explanation:

The equation for the circumference of a circle is C = 2*pi*r, where r is the radius.  Given that the actual value of the circumference is 3 pi, we equate this 3 pi to 2*pi*r:  3 pi = 2*pi*r.  

Dividing both sides of this equation by pi, we get 3 = 2r, so that r = 3/2.

The formula for the area of a circle of radius r is A = pi*r^2.

Here r = 3/2, so the area of this circle is

A = pi*(3/2 units)^2 = pi(9/4) units^2, or   A = (9/4)*pi units^2.

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irina1246 [14]

Answer:

d. 9

Step-by-step explanation:

i friken used all my attempts guessing on this and got it wrong all times so 9 is the last answer

3 0
3 years ago
The width of a rectangle is the sum of the length and 1. The area of the rectangle is 20 units. What is the width, in units, of
IRISSAK [1]

Answer:

W=5

Step-by-step explanation:

W=Width=Length + 1

L = Length

Area = Length * Width = 20

Area = L * W = L * (L+1) = 20

Distribute the L:   L^2 + L = 20

Subtract 20 from both sides: L^2 + L -20 = 20-20

Simplify:  L^2+L-20=0

Factor (L-4)(L+5)=0

Solve using the zero property: L-4=0, L=4      L+5=0, L=-5

The two options for length are 4 and -5. Only 4 will work for L since it cannot be negative.   Width is Length + 1 = 5

6 0
3 years ago
What is the solution to the equation below?<br><br><br><br> 0.5n = 6
Tcecarenko [31]

It's 12 because if you divide 6 by 0.5 you should get 12, so basically use the opposite operation.

Hope that helps!

3 0
3 years ago
What would be the measure of angle J?
horsena [70]

Answer:

5q I would say

Step-by-step explanation:

As

3

x

−

q

=

5

q

, adding

=

q

on both sides, we get

3

x

−

q

+

q

=

5

q

+

q

or

3

x

=

6

q

, now multiplying both sides by

1

3

, we get

3

x

×

1

3

=

2

6

q

×

1

3

or

x

=

2

q

4 0
3 years ago
Simplify this expression: 4p + 9 + (–7p) + 2        A. 3p + 11  B. 11p + 11  C. –3p + 11  D. 3p + 7
lutik1710 [3]
4p - 7p + 9 + 2
= -3p + 11
=C
8 0
3 years ago
Read 2 more answers
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