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jasenka [17]
3 years ago
12

What is the exact circumference of the circle?

Mathematics
2 answers:
Solnce55 [7]3 years ago
7 0

Answer:

The answer is 8 cm

Step-by-step explanation:

I did the test

denis23 [38]3 years ago
6 0
Remember, the formula for circumference is c = πd. If your diameter is 8 inches, then your circumference is 8π inches.
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What is the cross-sectional area of a cement pipe 2 in. thick with an inner diameter of 5 ft? Use pie 3.14.
Paul [167]

Answer:

1.60 ft^{2}

Step-by-step explanation:

Assuming that this is a cylindrical pipe, the area can be determined by applying the formula for calculating the area of a circle.

i.e Area = \pir^{2}

So that,

for the inner part of the pipe,

r = \frac{diameter}{2}

 = \frac{5}{2}

 = 2.5 feet

Area of the inner part of the pipe = \pir^{2}

                                 = 3.14 x (2.5)^{2}

                                 = 19.625

Are of the inner part of the pipe is 19.63 ft^{2}.

Total diameter of the pipe = 5 + 0.2

                                           = 5.2 feet

r = \frac{5.2}{2}

 = 2.6 feet

Area of the pipe = \pir^{2}

                            = 3.14 x (2.6)^{2}

                            = 21.2264

Area of the pipe is 21.23 ft^{2}.

Thus the cross sectional area = Area of the pipe - Area of the inner part of the pipe

                                           = 21.2264 - 19.625

                                           = 1.6014

The cross sectional area of the cement pipe is 1.60 ft^{2}.

6 0
3 years ago
square root of 3x + 12 = 9 is it extraneous or not extraneous? Solve the solution for X and show the steps pls!
OverLord2011 [107]

Answer:

X = -1

Step-by-step explanation:

Subtract 12 from both sides

Subtract 12 from 9 to get -3

Divide both sides by 3

Divide -3 by 3 to get -1

5 0
3 years ago
A person who weighs 120 pounds on Earth weighs 20 pounds on the Moon. How much does a 93-pound person weigh on the Moon?
Andre45 [30]
If you would like to know how much does a 93-pound person weigh on the Moon, you can calculate this using the following steps:

120 pounds on the Earth ... 20 pounds on the Moon
93 pounds on the Earth ... x pounds on the Moon = ?

120 * x = 20 * 93      /120
x = 20 * 93 / 120
x = 15.5 pounds on the Moon

The correct result would be 15.5 pounds on the Moon.
5 0
3 years ago
Read 2 more answers
The roots of x² - 4x = 5, in ascending order, are what?? PLEASE HELP
Oxana [17]

Answer:

it either -1 or 5 but I'm pretty sure it's -1

6 0
3 years ago
Read 2 more answers
An item costs $430 before tax, and the sales tax is $25.80.
bekas [8.4K]

Answer:

Step-by-step explanation:

if the item is 430, and the sales tax is 25.80

we can find how much is 1%

430/100=4.30

25.80/4.30=6

the sales tax is 6%

8 0
3 years ago
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