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vodomira [7]
2 years ago
13

Pls help on my maths

Mathematics
2 answers:
skad [1K]2 years ago
4 0
<h3><u>Answer:</u></h3>
  • r = 2.82
<h3><u>Step-by-step explanation:</u></h3>

<u>Given: </u>

  • A = 25

<u>Let's simplify.</u>

  • => 25 = \frac{22}{7} r^{2}
  • => \frac{25}{\frac{22}{7} } = \frac{\frac{22}{7}r^{2}  }{\frac{22}{7\\} }
  • => \frac{7(25)}{22} = r^{2}
  • => \sqrt{\frac{25(7)}{22}}= \sqrt{r^{2}}
  • => \sqrt{\frac{25(7)}{22}}= r
  • => r = 2.82 (Estimated)

<u>Therefore, r ≈ 2.82.</u>

Hoped this helped.

Aleks [24]2 years ago
4 0

Answer:

r= 5/√  π

or

r=2.820948 or simplified =2.82

​

Step-by-step explanation: it could be either one of these

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3 years ago
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nikklg [1K]
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3 years ago
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Find an equation of the circle and sketch it if it has: Center on y=4, tangent x-axis at (–2, 0)
Digiron [165]

Answer:

(x+2)^2+(y-4)^2=16

OK, lets start by drawing a basic graph (the first one) so we can visualize.

We already know that the y coordinate of the circle's center is 4.

We know that the circle is tangent to the X axis at (-2,0)

That means the x coordinate of the center has to be -2, as the tangent is a point on the edge of the circle that touches a line at exactly one point.

The radius is the distance from the center of the circle to its edge. We know the center's location now, it is (-2, 4) and a point on the edge of the circle (the tangent point) which is (-2,0). so the distance between the points is 4 which is the radius (you can use the distance formula, but it's quite oblivious.)

We can imagine the circle should look like this (the second one):

Now we can piece together an equation

The equation of a circle is (x-h)^2+(y-k)^2=r^2 where (h,k) is the center and r is the radius. When we put the numbers in: we get (x-(-2))^2+(y-(4))^2=4^2 which can be simplified into (x+2)^2+(y-4)^2=16 which is the answer.

Step-by-step explanation:

4 0
3 years ago
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svlad2 [7]
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First, we're doing the problem in the parenthesis.
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Then we would do multiplication, but there is nothing to multiply so we move onto division.
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Now we would add, but there is nothing to add so we move onto subtraction.
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Our final answer would be -16.

Hope this helps!~
7 0
3 years ago
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A little help would be nice!
gizmo_the_mogwai [7]

Answer:

1 in : 6 ft

Step-by-step explanation:

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