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Lunna [17]
3 years ago
14

The diameter of a circle is 4 kilometers. What is the circle's circumference?

Mathematics
2 answers:
iragen [17]3 years ago
7 0

Answer:

12.56km

Step-by-step explanation:

C=2pi r

2r=d

C=pi d=4pi=4x3.14=12.56km

scZoUnD [109]3 years ago
6 0

Answer:

12.57 km

Step-by-step explanation:

Radius = 4 / 2 = 2 km

Circumference = 2πr = 2π(2) = 4π = 12.57 km

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Nick was thinking of a number. Nick halves it and gets an answer of 39.5. What was the original number?
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Please help I don't understand this
Dmitrij [34]
4>-3
-2>-5
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<img src="https://tex.z-dn.net/?f=%20%5Csqrt%7B2x%7D%20%2B%2012%20%3D%20x%20%2B%208%20" id="TexFormula1" title=" \sqrt{2x} + 12
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First note that x\ge0; otherwise \sqrt{2x} is undefined as long as we're only looking for real solutions.

We can write

\sqrt{2x}+12=x+8
\sqrt{2x}=x-4
2x=(x-4)^2
2x=x^2-8x+16
x^2-10x+16=0
(x-8)(x-2)=0

\implies x=8,x=2
4 0
3 years ago
Triangle JKL has an area of in2 and a perimeter of in.
S_A_V [24]

Answer:

Area = 24 in²

Perimeter = 24in

Step-by-step explanation:

To find the area given the length of the 3 sides:

a= 8in

b= 6.4in + 3.6in= 10in

c= 6in

Add them together:

8in + 10in + 6in

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To find the perimeter you do the same thing:

a= 8in

b= 10in

c= 6in

Add them together

=24in

DO <u>NOT</u> SQUARE THE ANSWER WHEN FINDING <u>PERIMETER</u>

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3 years ago
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