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2 years ago

I am supposed to find the surface area. My answer is 378ft2. Is my answer correct?

Mathematics

1 answer:

Zepler [3.9K]2 years ago

4 0

I got 280ft^2. I multiplied the areas by 2 because the opposite sides are equal.

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2 years ago

Please help.........

faust18 [17]

The answer for PA is 60/13. This is found by
The area of the rectangle is 60, therefore, the big triangle areas are 30 each. We know that the hypotenuse is 13, so therefore, we get
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3 years ago

An ellipse has foci located at (2,4) and (2,16) and vertices located at (2,0) and (2,20) this ellipse is vertical

pochemuha

Answer:

The equation of the ellipse is $\frac{(x-2)^{2}}{8^{2}}+\frac{(y-10)^{2}}{10^{2}} = 1$ .

Step-by-step explanation:

The statement is incomplete, the most probable outcome may be the equation of the ellipse based on information given.

The equation of an ellipse whose major axis is vertical and is centered at a point different from origin is defined by:

$\frac{(x-h)^{2}}{b^{2}} + \frac{(y-h)^{2}}{a^{2}} = 1$ (1)

Where:

$(h,k)$ - Coordinates of the center of the ellipse.

$(x,y)$ - Coordinates of a point in the line of the ellipse.

$a$ - Length of the major semiaxis.

$b$ - Length of the minor semiaxis.

The coordinates of the center of the ellipse is midpoint of the segment between vertices, which are collinear with foci:

$(h,k) = \frac{1}{2}\cdot V_{1} (x,y) + \frac{1}{2}\cdot V_{2}(x,y)$ (1)

Where $V_{1} (x,y)$ and $V_{2} (x,y)$ are the coordinates of the vertices.

If we know that $V_{1} (x,y) = (2,0)$ and $V_{2} (x,y) = (2, 20)$ , then the coordinates of the center ellipse are:

$(h,k) = (2, 10)$

The length of the semimajor axis can be determined by using the following vectorial expression, which is equivalent to the Pythagorean Theorem:

$a = \sqrt{[(h,k)-V_{1}(x,y)]\,\bullet\,[(h,k)-V_{1}(x,y)]}$ (2)

If we know that $(h,k) = (2, 10)$ and $V_{1} (x,y) = (2,0)$ , then the length of the semimajor axis is:

$a = \sqrt{(2-2)^{2}+(10-0)^{2}}$

$a = 10$

And the length of the minor semiaxis is found by means of this Pythagorean identity:

$b = \sqrt{a^{2}-c^{2}}$ (3)

Where $c$ is the length between the center and any of the foci. This distance can be found by using this vectorial formula:

$c = \sqrt{[(h,k)-F_{1}(x,y)]\,\bullet\,[(h,k)-F_{1}(x,y)]}$ (4)

If we know that $(h,k) = (2, 10)$ and $F_{1} (x,y) = (2,4)$ , then the length between the center and any of the foci is:

$c = \sqrt{(2-2)^{2}+(10-4)^{2}}$

$c = 6$

And the length of the minor semiaxis is:

$b = \sqrt{10^{2}-6^{2}}$

$b = 8$

FInally, the equation of the ellipse is $\frac{(x-2)^{2}}{8^{2}}+\frac{(y-10)^{2}}{10^{2}} = 1$ .

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2 years ago