# math

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find the area of this ring to the nearest square unit. Show your work.
The image shows a ring, the inside raius is 2.0m, and the outside radius is 3.2m. The area of the ring is...
plz help!! thx.

• math -

First, let's get the outside area.

A = pi * r^2
A = 3.14 * 10.24
A = 32.1536

Now, the inside area:

A = 3.14 * 2^2
A = 12.56

Subtract:

32.1536 - 12.56 = ?

• math -

wow. ur really good! =) thank you!

• math -

You're welcome. :-)

• math -

Combine like terms, in this case simplify to multiply:
3.2^2pi its 10.24pi
2^2pi its 4pi

then subtract like terms
(10.24 - 4) pi = 6.24pi
~19.59SqU (Square Units)

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