Liv1234
  • Liv1234
PLEASE PLEASE PLEASE PLEASE PLEASE HELP ME
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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Liv1234
  • Liv1234
anonymous
  • anonymous
what do you need help with
Liv1234
  • Liv1234
The question I just posted

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More answers

anonymous
  • anonymous
i see now do you know how to find the area of a regular octagon
alekos
  • alekos
area = length x length so from here you can work out what the answer might be
Liv1234
  • Liv1234
I think it's either A or C.
alekos
  • alekos
your just guessing
Liv1234
  • Liv1234
No, wouldn't it be 210 because 35*6=210?
anonymous
  • anonymous
ya you shouldnt guess
Liv1234
  • Liv1234
I'm not just guessing......
alekos
  • alekos
If you increase the length by 6 then the area will increase by 6 squared
Liv1234
  • Liv1234
So, it is A?
Liv1234
  • Liv1234
Because 35*6^2=1260
alekos
  • alekos
well done
Liv1234
  • Liv1234
Can you help me with another question?
alekos
  • alekos
yep
Liv1234
  • Liv1234
Liv1234
  • Liv1234
Is there a specific formula I'm supposed to do to solve this one?
Liv1234
  • Liv1234
@alekos I got 25.12 for some reason, but that's not an option.
alekos
  • 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
  • Liv1234
the fraction would be 1/2 since we have half a circle.
alekos
  • alekos
No we don't. Half a circle would be 180 degrees. We have 172 degrees
Liv1234
  • Liv1234
Ohh, I'm sorry that's right. So 172.
Liv1234
  • Liv1234
So, how would I calculate it?
alekos
  • alekos
and the fraction is 172/?
Liv1234
  • Liv1234
172/1?
Liv1234
  • Liv1234
Or 172/4?
alekos
  • alekos
No. Whats the number of degrees of a full circle?
Liv1234
  • Liv1234
360
alekos
  • alekos
yes. so the fraction is ?
Liv1234
  • Liv1234
172/360
alekos
  • alekos
beautiful. so this is what you have to multiply by the area of the circle with radius 4
Liv1234
  • Liv1234
172/360*4
alekos
  • alekos
no. whats the area of a circle?
Liv1234
  • Liv1234
360?
alekos
  • alekos
no. thats the number of degrees. Have you been taught the area formula?
Liv1234
  • Liv1234
We're trying to figure out the area, right? So how would I know the area?
alekos
  • alekos
Yes we are. I'm asking you if you know the Area formula of a full circle with radius r
Liv1234
  • Liv1234
pi*r^2
Liv1234
  • Liv1234
The answer is 24.
alekos
  • alekos
OK. now we're getting somewhere So the area of the arc (172 deg) = (172/360)*pi*r^2
alekos
  • alekos
do you follow?
Liv1234
  • Liv1234
The answer is 24.

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