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lianna [129]
2 years ago
9

Calculate the area of a regular octagon if the radius is 10 cm long.

Mathematics
2 answers:
charle [14.2K]2 years ago
8 0

Answer:

Area is A≈282.8 cm  

Step-by-step explanation:

luda_lava [24]2 years ago
6 0

Answer:

A=2(1+ √2)a2

482.84271

Step-by-step explanation:

:))

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What is 2x – 3 < 7 and 5 – x ≤ 8?
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Answer:

\begin{bmatrix}x

Step-by-step explanation:

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7 0
3 years ago
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Solve for d: 0.5(2d-6)=0.2(4x-10)
Law Incorporation [45]

Answer:d=0.8x+1

Step-by-step explanation:

To solve 0.5(2d-6)=0.2(4x-10)

Open the brackets

We get

d-3=0.8x-2

To make d the subject of formular

d=0.8x-2+3

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7 0
3 years ago
A circle is inscribed in a square. Write and simplify an expression for the ratio of the area of the square to the area of the c
STALIN [3.7K]
 Best Answer:<span>  </span><span>So first we need both areas, then we can relate them, and then divide the circle by the square: 

A(circle) = πr^2 
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For the square, we know this is true because because the radius is half the diameter, so if we multiply the radius by 2, we get the length of one side of the square. We also know that the lengths of both sides of the square are the same by definition of a square. 

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8 0
3 years ago
Triangle QRS is a right triangle.
olasank [31]

Answer:

5.3

Step-by-step explanation:

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6² + RS² = 8²

RS² = 64 -36

RS² = 28

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RS = 5.3                    actually 5.2915  to a few more significant digits

5 0
3 years ago
Find last​ year's salary​ if, after a 4% pay​ raise, this​ year's salary is 31,720
adoni [48]

Answer:

30500.

Step-by-step explanation:

104%=31,720

100%=  x

\frac{(31720)(100)}{104}=30500

3 0
2 years ago
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