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devlian [24]
2 years ago
4

Find the area of the shaded regions below. Give your answer as a completely simplified exact value in terms of π (no approximati

ons).

Mathematics
1 answer:
sergey [27]2 years ago
8 0

Answer:

See below

Step-by-step explanation:

Outline

  • First find the diameter, LN. Then find the radius, NO
  • Then find the area of the semi circle LMN
  • Finally the area of the triangle.
  • Subtract semi circle and triangle.

Step One

The Pythagorean Theorem says a^2  +  b^2 = r^2

  • <N = 180 - 90 - 45 Property of a triangle
  • a = b = 4                 The triangle is isosceles Two 45o angles
  • 4^2 + 4^2 = c^2      Expand
  • 16 + 16 = c^2           Add
  • 32 = c^2                  Take the square root of both sides
  • sqrt(c^2) = sqrt(32)
  • c = sqrt(16 * 2)
  • c = 4 * sqrt(2)
  • The diameter of the circle is 4 sqrt(2)
  • The radius =d/2 = 4 * sqrt(2)/2 = 2 sqrt(2)

Step Two

Find the area of the of the Semi Circle

<u>Formula</u>

  • Area = pi r^2 / 2

<u>Solution</u>

  • Area = pi * (2*sqrt(2) )^2 / 2
  • Area = pi * 4 * 2 / 2
  • Area = 4 pi

Step 3

Find the area of the triangle.

<u>Area</u>

The two legs are at right angles and they both = 4

  • Area = b*h/2
  • Area = 4*4/2
  • Area = 8

Step Four

Area shaded part = 4pi - 8

There are all kinds of possible answers. Here are a couple

  • Area= 4(pi - 2)
  • Area = 4pi - 8
  • Area= 4.56

If none of these are among your choices, leave a note.


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3. The area of a rectangular deck, in square meters, is given by the polynomial 40p2 + 24p.
lorasvet [3.4K]

Answer:

Length = 5p + 3

Perimeter = 26p + 6

Step-by-step explanation:

Given

Area = 40p² + 24p

Width = 8p

Solving for the length of deck

Given that the deck is rectangular in shape.

The area will be calculated as thus;

Area = Length * Width

Substitute 40p² + 24p and 8p for Area and Width respectively

The formula becomes

40p² + 24p = Length * 8p

Factorize both sides

p(40p + 24) = Length * 8 * p

Divide both sides by P

40p + 24 = Length * 8

Factorize both sides, again

8(5p + 3) = Length * 8

Multiply both sides by ⅛

⅛ * 8(5p + 3) = Length * 8 * ⅛

5p + 3 = Length

Length = 5p + 3

Solving for the perimeter of the deck

The perimeter of the deck is calculated as thus

Perimeter = 2(Length + Width)

Substitute 5p + 3 and 8p for Length and Width, respectively.

Perimeter = 2(5p + 3 + 8p)

Perimeter = 2(5p + 8p + 3)

Perimeter = 2(13p + 3)

Open bracket

Perimeter = 2 * 13p + 2 * 3

Perimeter = 26p + 6

4 0
2 years ago
True or False? A circle could be circumscribed about the quadrilateral below.
SVEN [57.7K]

Answer:

<em>The correct answer is:   False</em>

Step-by-step explanation:

<u>If the sum of the opposite angles in a quadrilateral is 180°</u>, then a circle can be circumscribed about the quadrilateral.

Here,  \angle B+\angle D= 110\°+90\° = 180\°

but,  \angle A+\angle C= 70\°+90\°= 160\°

So, a circle can't be circumscribed about the given quadrilateral.

7 0
2 years ago
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Which of the following terms appear in the expansion of (x+y)^8? The letter a in each term represents a real constant.
Sedbober [7]

The given expression is

(x+y)^8

The exponent of x is decreasing and y in increasing .

That is ,

a x^8 +  b x^7y+ c x^6y^2 + d x^5 y ^3 + e x^4 y^4 + f x^3 y^5 + g x^2 y^6 +h x y^7 + i y^8

Where a,b,c,d,e,f,g,h,i are th constants

So the correct options are b and d .

5 0
2 years ago
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Which expression is equivalent to 144 Superscript three-halves? 216 1,728 RootIndex 3 StartRoot 12 EndRoot RootIndex 3 StartRoot
Afina-wow [57]

Question:

Which expression is equivalent to 144^(3/2)

Answer:

1728

Step-by-step explanation:

The options are not well presented. However, this is the solution to the question.

Given:

144^(3/2)

Required:

Find Equivalent.

We start my making use of the following law of logarithm.

A^(m/n) = (A^m)^1/n

So,

144^(3/2) = (144³)^½

Another law of indices is that

A^½ = √A

So,

144^(3/2) = (144³)^½ = √(144³)

144³ can be expanded as 144 * 144 * 144.

This gives

144^(3/2) = √(144 * 144 * 144)

The square root can then be splitted to

144^(3/2) = √144 * √144 * √144

144^(3/2) = 12 * 12 * 12

144^(3/2) = 1728.

Hence, the equivalent of 144^(3/2) is 1728

8 0
2 years ago
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Anand needs to hire a plumber. He's considering a plumber that charges an initial fee of \$65$65dollar sign, 65 along with an ho
Mandarinka [93]

Answer: (1) C. 65 + 28H < 250

(2) 6

Step-by-step explanation:

Here is the correct question:

Anand needs to hire a plumber. He's considering a plumber that charges an initial fee of $65 along with an

hourly rate of $28. The plumber only charges for a whole number of hours. Anand would like to spend no more than $250, and he wonders how many hours of work he can afford.

Let H represent the whole number of hours that the plumber works.

1) Which inequality describes this scenario?

Choose 1 answer:

A. 28 + 65H < 250

B. 28 + 65H > 250

C. 65 + 28H < 250

D. 65 +28H > 250

2) What is the largest whole number of hours that Anand can afford?​

Since the initial fee charged by the plumber is $65 and an hourly rate of $28, and Anand would like to spend no more than $250. This means that the addition of the initial fee plus the hourly fee based on number of hours worked will have to be less than $250. This can be mathematically expressed as:

= 65 + 28H < 250

That means option C is the correct answer.

Option B and D are incorrect because the greater sign was used but Anand doesn't want to spend more than $250 but the options denoted that he spent more than $250 which isn't correct.

2)'The largest whole number of hours that Anand can afford goes thus:

65 + 28H < 250

28H < 250 - 65

28H < 185

H < 185/28

H < 6.6

Therefore, the largest whole number of hours that Anand can afford is 6.

5 0
2 years ago
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