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I am Lyosha [343]
2 years ago
5

Find the area of the shaded regions. Give your answer as a completely simplified exact value in terms of pi (no approximations)

Mathematics
1 answer:
Helen [10]2 years ago
7 0

Answer:

A = 27π cm²

Step-by-step explanation:

the area (A) of the sector is calculated as

A = area of circle × fraction of circle

the central angle of the shaded sector = 360° - 90° = 270° , then

A = πr² × \frac{270}{360}

  = π × 6² × \frac{3}{4}

  = 36π × \frac{3}{4}

  = 9π × 3

 = 27π cm²

 

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Studentka2010 [4]

Answer:

<h2>               A.  ¹²/₅</h2>

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There is no solution for system of equations:  a_1x+b_1y=c_1\\a_2y+b_2y=c_2

if:     a_1=a_2\quad and\quad b_1=b_2\quad and\quad \bold{c_1\ne c_2}

so first, we we need to transform the equations to the form where the coefficients at y will be the same:

kx-3y=4\\ 4x-5y=7\\\\ (kx-3y)\cdot5=4\cdot5\\ (4x-5y)\cdot3=7\cdot3\\\\ 5kx-15y=20\\ 12x-15y=21

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5k = 12

÷5     ÷5

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