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NARA [144]
3 years ago
5

Find the circumference of a circular window if the area is 100pi sq units

Mathematics
2 answers:
padilas [110]3 years ago
7 0
20pi sq units
.............
-BARSIC- [3]3 years ago
6 0

For this problem, using the area of the circle, we have to work backwards to find the radius to find the circumference

The area of the circle (A) = 100π units

A = 100π

The formula for area of a circle

A = πr²

Since we know what A is, lets plug it into the equation for area of a circle to solve for r

100π = πr²

Divide π from both sides to cancel them out

100 = r²

Take the square root of both sides to isolate r, the radius

r = 10

Now that we know what r is, let's plug it into the equation for the circumference of a circle

Circumference = 2πr

= 2π(10)

Multiply 2 and 10, because both are like terms

Circumference of the window = 20π

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Joe bought 5 apples and 4 bananas for $6. Dawn bought 3 apples and 6 bananas for $6.30. How much foes each apple and each banana
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Answer:

Apple = $0.6

Banana = $0.75

Step-by-step explanation:

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For Joe,

5A + 4B = 6       (1)

For Dawn

3A + 6B = 6.3     (2)

To eliminate A, Multiply equation (1) by 3 and equation (2) by 5

15A + 12B = 18          (3)

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subtracting equation (4) from (3)

15A - 15A +12B - 30B = 18 - 31.5

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divide through by -18

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substitute 0.75 in equation (1)

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subtract 3 from both sides

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