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vitfil [10]
3 years ago
14

The radius of a circle is doubled. How does the area change?

Mathematics
1 answer:
ra1l [238]3 years ago
8 0

Answer:

Area increases by a factor of 4

Step-by-step explanation:

The area (A) of a circle is calculated as

A = πr²

If the radius is doubled, that is r = 2r, then

A = π(2r)² = 4πr²

Hence the area has been increased by a factor of 4

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2 years ago
I need some help on this math problem, thanks so much
bekas [8.4K]

Answer:

The answer is C.

Step-by-step explanation:

Hit 'em with the Law of Sines.

sin(A)/a = sin(B)/b.

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sin(x)/5 = sin(B)/b.

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sin(x)/5 = 1/20.6

sin(x)/5 = 0.04854...

sin(x) = 0.2427...

You can plug in sin^-1(0.2427) into your calculator, and you should end up with something like 14.047... which equates to answer choice C.

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3 years ago
The perimeter of an isosceles triangle is 110 m two of the links are 40 and 30 m what is the area of the triangle
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