PLEASE PLEASE PLEASE PLEASE PLEASE HELP ME

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- Liv1234

PLEASE PLEASE PLEASE PLEASE PLEASE HELP ME

- katieb

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- Liv1234

##### 1 Attachment

- anonymous

what do you need help with

- Liv1234

The question I just posted

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## More answers

- anonymous

i see now do you know how to find the area of a regular octagon

- alekos

area = length x length
so from here you can work out what the answer might be

- Liv1234

I think it's either A or C.

- alekos

your just guessing

- Liv1234

No, wouldn't it be 210 because 35*6=210?

- anonymous

ya you shouldnt guess

- Liv1234

I'm not just guessing......

- alekos

If you increase the length by 6 then the area will increase by 6 squared

- Liv1234

So, it is A?

- Liv1234

Because 35*6^2=1260

- alekos

well done

- Liv1234

Can you help me with another question?

- alekos

yep

- Liv1234

##### 1 Attachment

- Liv1234

Is there a specific formula I'm supposed to do to solve this one?

- Liv1234

@alekos I got 25.12 for some reason, but that's not an option.

- alekos

yes there is a specific formula
Area of a circle is pi x r^2 but in this case we only have part of a circle or a fraction of a circle. What do you think that fraction will be?

- Liv1234

the fraction would be 1/2 since we have half a circle.

- alekos

No we don't. Half a circle would be 180 degrees. We have 172 degrees

- Liv1234

Ohh, I'm sorry that's right. So 172.

- Liv1234

So, how would I calculate it?

- alekos

and the fraction is 172/?

- Liv1234

172/1?

- Liv1234

Or 172/4?

- alekos

No. Whats the number of degrees of a full circle?

- Liv1234

360

- alekos

yes. so the fraction is ?

- Liv1234

172/360

- alekos

beautiful. so this is what you have to multiply by the area of the circle with radius 4

- Liv1234

172/360*4

- alekos

no. whats the area of a circle?

- Liv1234

360?

- alekos

no. thats the number of degrees. Have you been taught the area formula?

- Liv1234

We're trying to figure out the area, right? So how would I know the area?

- alekos

Yes we are. I'm asking you if you know the Area formula of a full circle with radius r

- Liv1234

pi*r^2

- Liv1234

The answer is 24.

- alekos

OK. now we're getting somewhere
So the area of the arc (172 deg) = (172/360)*pi*r^2

- alekos

do you follow?

- Liv1234

The answer is 24.

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