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ehidna [41]
3 years ago
5

Which is the area of a circle with circumference of 15.7 units?( Use 3.14 for )

Mathematics
2 answers:
Levart [38]3 years ago
7 0
Circumference of a circle= 2πr = 15.7
from this radius r= 15.7/ 2π
r= 15.7/(2x 3.14)
r= 15.7/ 6.28 = 2.5
therefore area = π r^2= π x r x r
= 3.14 x 2.5 X 2.5 = 19.625 sq units
damaskus [11]3 years ago
4 0
A = π(r²) --- r is radius

C = πd --- d is diameter

First, the circumference must be found. If the circumference is 15.7, plug it in.

15.7 = πd

We know what pi is.

15.7 = 3.14 (d)

Now, simply divide 3.14 by 15.7 to find the diameter (d). You get 5. Since the radius is half of the diameter, the radius is 2.5. Plug this into the area formula, and plug pi in, too.

A = 3.14(2.5²) 

2.5 to the second power is 6.25.

A = 3.14(6.25)

Tada! Multiply, and you're left with 19.625!
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Answer:

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$2900 st 5%.

Step-by-step explanation:

Let x be the amount invested at rate of 8% and y be the amount invested at the rate of 5%.

We have been given that Heather has divided ​$5400 between two​ investments. We can represent this information as:

x+y=5400...(1)

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Earnings from the investment at 8% will be 8% of x.

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We will use substitution method to solve our system of equations. From equation (1) we will get,

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Substituting this value in equation (2) we will get,

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432-0.08y+0.05y=345

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Let us substitute y=2900 in equation (1) to solve for x.

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