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3 years ago

HELP!

Mathematics

2 answers:

Akimi4 [234]3 years ago

4 0

Answer:

Step-by-step explanation:

Alright, lets get started.

Please refer the diagram I have attached.

There will be 8 triangles made.

The center angle will be = $\frac{360}{8}=45$

The triangle will be formed an isosceles triangle, so remaining angle will be :

$\frac{180-45}{2}=67.5$

$sin 67.5=\frac{opposite}{5}$

opposite= CD = $5sin67.5=4.6194$

Similarly,

adjacent = BD = $5cos67.5=1.9134$

The complete AB will be = $2*1.9134=3.8268$

Area of triangle ABC will be = $\frac{1}{2}*base*height = \frac{1}{2}*3.8268*4.6194=8.838$

So, the area of octagon will be 8 times area of this triangle.

Area of octagon will be = $8*8.838=70.70$

Hence are the area of octagon is 70.70 : Option D : Answer

Hope it will help :)

Nuetrik [128]3 years ago

3 0

the answer is d I know this one

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1/2 times ? Equals 3 1/2

stepan [7]

Answer:

Step-by-step explanation:

1/2(x)=7/2

divide both sides by 1/2

x= $\frac{7}{2}$ ÷ $\frac{1}{2}$

x= $\frac{7}{2}$ · $\frac{2}{1}$

x=14/2=7

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2 years ago

The city of Yorkton, Saskatchewan, has an area of 24.0 km^2. If this city were a perfect square, what would it’s exact perimeter

Elis [28]

Answer:

8 $\sqrt{6}$ inches

Step-by-step explanation:

Let l represent the length of the square

The area of a square = l^2

That means,

l^2 = 24 km^2

Take the square root of both sides

l = $\sqrt{24}$

l = $\sqrt{4*6$

l = $\sqrt{4} *\sqrt{6}$

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Now lets find the perimeter

Perimeter of a square, P = 4l

P = 4* 2 $\sqrt{6}$

P = 8 $\sqrt{6}$ inches

3 0

3 years ago

Una ciudad tenía 8000 habitantes a final del año 2000. Cada año su población se incrementa en un 0.5 %

Digiron [165]

Answer:

The correct answer is 2030.

Step-by-step explanation:

To start we must analyze the information we have.

We know that a city has 8000 inhabitants and that each year this number increases by 0.5%. That means that each year it has 40 more inhabitants:

(8000 . 0,5) : 100 = 40

Having this information we could do a cross multiplication:

1 year ------- 40 inhabitants

x years ------- 81200

81200 = 40.x

x = 81200 : 40

x = 2030

In this way we can verify that the correct answer is 2030.

4 0

3 years ago

7 2/3 + 9 3/4= Plz help A. 17 1/2 B. 16 5/12 C. 16 5/7 D. 17 5/12

Elis [28]

The answer is D. 17 5/12

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3 years ago

Mia wants to purchase a pair of jeans. The first time she saw the jeans, they were priced at $36. When she goes back to make the

jasenka [17]

Answer: D

Step-by-step explanation:

1. Subtract 36 to 28.80

2. Divide the answer to the first price (36.00)- 7.5 divided by 36.00 or 36

3. When you calculate and find the answer as a decimal, then make it into a percentage

So if... you divide 7.5 divided by 36, you get the decimal of 0.2, and when you move the decimals two places only, you get your answer of 20%.

Hopefully it helped you!. Have a good day :-).

8 0

2 years ago