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Oksi-84 [34.3K]

3 years ago

9

The ratio of the sides of two similar regular octagons is 4:7. If the measure of each side of the larger octagon is 28 cm, then

the measure of each side of the smaller octagon is ________cm. Enter a number answer only.

1 answer:

Virty [35]3 years ago

8 0

Answer:

16 cm.

Step-by-step explanation:

It is 4 times the ratio.

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3 years ago

Determine whether the following statements are true and give an explanation or counterexample. If f is not one-to-one on the int

Natasha2012 [34]

Answer:

Step-by-step explanation:

The missing equation is:

$S = \int ^b_a 2 \pi f(y) \sqrt{1 + f' (y)^2 } \ dy$

Suppose f = nonnegative function whose first derivative is within (a,b) and it is continuous, Then the area of the surface generated is revolved about the x-axis:

The area of the surface revolution is:

$S = \int ^b_a 2 \pi f(x) \sqrt{1 + f' (x)^2 } \ dx$

So; if $x = g(y)$ for $y \ \varepsilon \ [c,d]$

Then; substituting a with c and b with d; f(x) also with g(y) and dx with dy;

Then;

$S = \int ^d_c 2 \pi g(y) \sqrt{1 + g' (y)^2 } \ dy$

SInce;

$g(y) \ne f(y)$ ; Then the statement is false.

Provided that the semicircle $y = \sqrt{1-x^2}$ isn't on $[-1,1]$ interval.

Then, the solid generated by the revolution about the x-axis is a sphere.

However, the surface is well defined and the statement is false.

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3 years ago