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Zinaida [17]
3 years ago
15

Suppose the circumference of a circle is 2 pi what is the area?

Mathematics
2 answers:
Olenka [21]3 years ago
5 0
C = 2 * pi * r

Plug in what we know:

2pi = 2 * pi * r

Divide 2 pi to both sides:

r = 1

(Remember, anything divided by itself is equal to 1)

A = pi * r^2

Plug in what we know:

A = pi * 1^2

A = pi * 1

A = 1 pi

So the area is '1 pi' or just 'pi'.
irina1246 [14]3 years ago
4 0
 <span>Circumference of a circle = 2 π r 

(where r is the radius) 

Area of a circle = π r^2 

(where r is the radius) 

you have to find the radius

C = 2π unit 
r = 1 unit 

Area = π square units 
</span>
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8 0
3 years ago
ou decide to bake some cakes. You need 150 g of flour for 12 cakes. How much flour do you need for 30 cakes? g
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You only need to set up a direct proportion

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flour for 12 cakes = 150 grams
Number of cakes initially = 12
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Number of cakes = 30

Proportion
amount flour for 12 cakes / 12 cakes  = x / 30

Sub and solve
150 grams / 12 cakes = x / 30 cakes  Cross multiply
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4500/12 = x
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