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lana [24]
3 years ago
7

A building engineer analyzes a concrete column with a circular cross section. The circumference of the column is 18π meters. Wha

t is the area of the cross section?
Mathematics
1 answer:
Whitepunk [10]3 years ago
7 0
Answer: 81pi square meters

--------------------------------------------------------

Work Shown

C = 18pi is the given circumference
d = diameter which is unknown

C = pi*d
18pi = pi*d
18 = d
d = 18

The diameter is 18 meters.
Half of this is the radius r = d/2 = 18/2 = 9
The radius is 9 meters

Use the value of r to find the area of the circle
A = pi*r^2
A = pi*9^2
A = pi*81
A = 81pi

The area of the circular cross section is 81pi square meters

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The triangles are congruent. Find the length of each hypotenuse.
Zina [86]
If the triangles are congruents:
1) AC must be congruent with FE→AC=FE→y+3=2y+1→
y+3-y-1=2y+1-y-1→
2=y→y=2

2) CB must be congruent with ED→CB=ED→5x+7=6x+2y→
5x+7-5x=6x+2y-5x→7=x+2y→x+2y=7

Replacing y=2 in the equation above:
x+2y=7→x+2(2)=7→x+4=7→x+4-4=7-4→x=3

Then the lenght of each hypotenuse is:
CB=5x+7=5(3)+7=15+7→CB=22
or
ED=6x+2y=6(3)+2(2)=18+4→ED=22

The length of each hypotenuse is 22
6 0
3 years ago
Can someone hurry help me
Dmitriy789 [7]

Answer:

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Step-by-step explanation:

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7 0
4 years ago
Can someone help me with these five problems please i will mark as brainliest if the answers are correct
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Answer:

1. C

2. B

3. C

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Step-by-step explanation:

4 0
3 years ago
Sarafina and Katie have between $105 and $420 dollars to spend on jewelry for Christmas presents for their friends. If they buy
algol13

Answer:

66

Step-by-step explanation:

105+420=525   (Total Money)

7x3.25=22.75   (Cost of all bracelets)

8x11.74=93.92   (Cost of all necklaces)

93.92+22.75=116.67   (Cost of all Christmas presents)

525-116.67=408.33   (Total money - Cost of all Christmas presents)

408.33/6.15=66.39...   (Amount of necklaces)

since in real life you can only buy a whole number of things, you would round down 66.39 to 66. I hope this helped!

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3 years ago
If you know that A neq 0 and B neq 0, how can you write an equation in point-slope form of the equation Ax + By = C? The equatio
navik [9.2K]

Answer:

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Among Us in real life (sus, sus)

Playing Among Us in real life, spaceship with my crew

Gonna split up, spread out 'cause we all got tasks to do

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Who can we trust in this Among Us entourage?

Heard a sound, turned around, looking up, looking down

Then I find a dead body

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Can't decide, so, now we leave, not sure what I'm about to see

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Who's the impostеr?

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Who's the imposter?

Looking sus, who can wе trust?

Who's the imposter?

Looking sus, who can we trust?

Who's the imposter?

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I'm a ghost, I'm my biggest fear, got killed by the imposter

I was playing in the game, but now I'm just a watcher

I'm paying attention using my 360 vision

If it gets quiet, I listen

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While everyone's doing tasks, I'm going through vents on a killing spree

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We can discuss whoever took your life

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That's me holding this knife

I'm the imposter

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4 0
3 years ago
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