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MA_775_DIABLO [31]
3 years ago
15

The circumference of a coin is 18π cm. What is the​ radius? What is the​ diameter?

Mathematics
2 answers:
ad-work [718]3 years ago
6 0
A coin is a circle. Circumference of a circle is determined using this following formula
2 × π × r = c
with r as the radius, and c as the circumference

Find the radius
To find the radius, use the formula above
2 × π × r = c
2 × π × r = 18π
2π × r = 18π
r = 18π/2π
r = 9
The radius of the circle is 9 cm

Find the diameter
The diameter is twice as long as the radius.
d = 2 × r
d = 2 × 9
d = 18
The diameter is 18 cm
Hoochie [10]3 years ago
4 0
6 I do believe so hope this helps!
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tatiyna
The drop down menus are not provided. However, I will help get the solution of the system of equation which is the requirement of the question.

<u><em>Answer:</em></u>
(3,14) and (-2,-1) are the solutions of the system

<u><em>Explanation:</em></u>
<u>The first equation given is:</u>
y = x² + 2x - 1 .........> equation I
<u>The second given equation is:</u>
y - 3x = 5
<u>This can be rewritten as:</u>
y = 3x + 5 ..........> equation II

<u>Equate equations I and II and solve for x as follows:</u>
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x² + 2x - 1 - 3x - 5 = 0
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either x-3 = 0 .........> x = 3
or x+2 = 0 ...........> x = -2

<u>Now, we get the values of y by substituting in equation II as follows:</u>
At x = 3:
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y = 14
The first solution is (3,14)

At x = -2:
y = 3x + 5
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The second solution is (-2,-1)

Hope this helps :)


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Step-by-step explanation:

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