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makvit [3.9K]
3 years ago
12

2. Rotate the following 180 degrees about point D.

Mathematics
1 answer:
Stella [2.4K]3 years ago
4 0
Just redraw it at a 180 degrees , it doesn’t say whether it goes clockwise or counterclockwise so I can’t give the exact answer
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Find a polynomial for the sum of the shaded<br> areas of the figure. A = 6, B = 4
soldi70 [24.7K]

Answer:

The polynomial for the sum of the shaded  \pi r² - 20 \pi

Step-by-step explanation:

Given as :

The figure is shown which is of concentric circle with radius B , A , r

The radius B = 4 unit

The radius A = 6 unit

Let The sum of shaded portion = x unit

Now, The circumference of circle = 2 \pi R , where R is the radius

So, for circle with radius B.

The circumference = 2 \pi R = 2 \pi B

Or, The circumference = 2 \pi × 4 = 8 \pi

<u>Similarly</u>

For circle with radius A.

The circumference = 2 \piR = 2 \pi A

Or, The circumference = 2 \pi × 6 = 12 \pi

Now, <u>The area of circle with radius r is</u>

Area = \pi ×radius × radius

Or, Area = \pi r²

Now,

The sum of shaded region area = The area of circle with radius r - ( The circumference with radius B + The circumference with radius A )

Or, The sum of shaded region area =  \pi r² - ( 8 \pi + 12 \pi )

Or,  The sum of shaded region area =  \pi r² - 20 \pi

Hence The polynomial for the sum of the shaded area is \pi r² - 20 \pi  Answer

5 0
3 years ago
If R is the total resistance for a parallel circuit with two resistors of resistances of r1 and r2 then 1/r=1/r1+1/r2 find the r
Allushta [10]
A little Algebra, and we're home free!

We are given R = 20 and r2 = 75. We need to find r1.

The formula is 1/R = 1/r1 + 1/r2. Plug-in:
1/20 = 1/r1 + 1/75
1/20 - 1/75 = 1/r1
0.0366 = 1/r1
r1 = 1/0.03666
r1 = 27.272

Our answer is r1 = 27 ohms.
6 0
3 years ago
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Mama L [17]

Answer:

1)13(left)

2)52(right)

3)48

4)51.923

Step-by-step explanation:

a^2+b^2=C^2

3 0
3 years ago
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Name a fraction equal to 1/2 with a denominator of 9
kolezko [41]
4.5/9. It is technically an improper fraction but it still counts.
3 0
2 years ago
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What is a^2+15^2=17^2<br><br> I can't figure out what A is... HELP PLSSSSSSSSSSSSSSSSSSSSS<br> :3
likoan [24]

Answer:

Step-by-step explanation:

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2 years ago
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