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Anni [7]
3 years ago
5

Find the area of the shaded region

Mathematics
2 answers:
Maksim231197 [3]3 years ago
7 0

Answer: 40

Step-by-step explanation:

Artist 52 [7]3 years ago
3 0

Answer:

16\pi - 24\sqrt{3}

Step-by-step explanation:

The shaded area is the area of the circle <u>minus</u> the area of the hexagon. (It's like a circle with a hexagon cut out of it.)

Area of the circle is A_\text{circle} =\pi r^2 = \pi\cdot 4^2 = 16\pi

Area of the hexagon. The attached image shows two radii drawn that create an equilateral triangle with three 60 degree angles.  The blue altitude (marked h) splits that triangle into two 30-60-90 triangles.  The bottom side is split into two 2-unit segments.  The altitude h is the short leg of the 30-60-90 triangle multiplied by \sqrt{3}.

So, the area of one equilateral triangle is \frac{1}{2}(\text{base})(\text{height})=\frac{1}{2}\cdot 4\cdot 2\sqrt{3}=4\sqrt{3}.

The hexagon is made up of 6 such equilateral triangles, so its area is A_\text{hexagon}=6\cdot 4\sqrt{3}=24\sqrt{3}

Finally, the shaded region has area (circle minus hexagon):

16\pi - 24\sqrt{3}

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Answer please I’m dying from math
charle [14.2K]

Answer:

\huge\boxed{\text{D)} \  15x^4 + 2x^3 - 8x^2 - 22x - 15}

Step-by-step explanation:

We can solve this multiplication of polynomials by understanding how to multiply these large terms.

To multiply two polynomials together, we must multiply each term by each term in the other polynomial. Each term should be multiplied by another one until it's multiplied by all of the terms in the other expression.

  • <em>We can do this by focusing on one term in the first polynomial and multiplying it by </em><em>all the terms</em><em> in the second polynomial. We'd then repeat this for the remaining terms in the second polynomial.</em>

Let's first start by multiplying the first term of the first polynomial, 3x^2, by all of the terms in the second polynomial. (5x^2+4x+5)

  • 3x^2 \cdot  5x^2 = 15x^4
  • 3x^2 \cdot 4x = 12x^3
  • 3x^2 \cdot 5 = 15x^2

Now, we can add up all these expressions to get the first part of our polynomial. Ordering by exponent, our expression is now

  • \displaystyle 15x^4 + 12x^3 + 15x^2

Now let's do the same with the second term (-2x) and the third term (-3).

  • -2x \cdot 5x^2 = -10x^3  
  • -2x \cdot 4x = -8x^2
  • -2x \cdot 5 = -10x
  • Adding on to our original expression: \displaystyle 15x^4 + 12x^3 - 10x^3 + 15x^2 - 8x^2 - 10x

  • -3 \cdot 5x^2 = -15x^2
  • -3 \cdot 4x = -12x
  • -3 \cdot 5 = -15
  • Adding on to our original expression: \displaystyle 15x^4 + 12x^3 - 10x^3 + 15x^2 - 8x^2 - 15x^2 - 10x - 12x - 15

Phew, that's one big polynomial! We can simplify it by combining like terms. We can combine terms that share the same exponent and combine them via their coefficients.

  • 12x^3 - 10x^3 = 2x^3
  • 15x^2 - 8x^2 - 15x^2 = -8x^2
  • -10x - 12x = -22x

This simplifies our expression down to 15x^4 + 2x^3 - 8x^2 - 22x - 15.

Hope this helped!

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