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vovikov84 [41]
3 years ago
7

A’’ = B’’ = C’’ = D’’ = ???

Mathematics
1 answer:
mezya [45]3 years ago
6 0

Answer:

B

Step-by-step explanation:

b I did the test its correct

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3 years ago
The circumference of a circle is 30t. What is its area? ​
labwork [276]

Answer:

A=\frac{225t^2}{\pi} given the circumference is 30t.

Step-by-step explanation:

The circumference of a circle is C=2\pi r and the area of a circle is A=\pi r^2 assuming the radius is r for the circle in question.

We are given the circumference of our circle is 2 \pi r=30t.

If we solve this for r we get: r=\frac{30t}{2\pi}.  To get this I just divided both sides by 2\pi since this was the thing being multiplied to r.

So now the area is A=\pi r^2=\pi (\frac{30t}{2 \pi})^2.

Simplifying this:

A=\pi (\frac{30t}{2 \pi})^2.

30/2=15 so:

A=\pi (\frac{15t}{\pi})^2.

Squaring the numerator and the denominator:

A=\pi (\frac{(15t)^2}{(\pi)^2}

Using law of exponents or seeing that a factor of \pi cancels:

A=\frac{(15t)^2}{\pi}

A=\frac{15^2t^2}{\pi}

A=\frac{225t^2}{\pi}

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3 years ago
Two angles are complementary. The smaller angle is 15° less than the larger angle. Find the measure of each angle.
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