- anonymous

What is the length of one side of a regular octagon if its perimeter is 72cm
no answers
@awillie98,@iihoop3 and others - will medal a maybe fan

- jamiebookeater

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- anonymous

Im not eve sure how to do this

- anonymous

lol its ok girl! no worries @TheSmartOne

- mathstudent55

How many sides does an octagon have?

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## More answers

- anonymous

8 of course

- anonymous

9

- anonymous

is the answer

- mathstudent55

Great.
What does "regular" mean in "regular octagon"?

- anonymous

9*8 sides of the octagon is 72

- anonymous

a regular octagon is just the regular kind ..wait I thought a octagon had 5 sides? sorry im just so tired

- anonymous

lmao no it has 8 sides

- anonymous

What is the measure of BAC ?
A.28
B.83
C.55
D.93
sorry I just tired ...I wa thinking C

##### 1 Attachment

- mathstudent55

No. You were correct the first time.
An octagon has 8 sides.
A regular polygon means that all sides are congruent, and all angles are congruent.
Since it has 8 sides of the same length, and the perimeter is 72 cm, then you can divide (72 cm)/8 = 9 cm, so you get that each side is 9 cm long.
If you were not told it is a regular octagon, you wouldn't be able to answer the question because the sides would have different lengths.

- mathstudent55

What do you know about the sum of the measures of the angles of a triangle?

- mathstudent55

|dw:1435685165487:dw|

- anonymous

@mathstudent55 can you help me out also

- anonymous

can u tll me the answer I have a time limit and I don't want to get in trouble

- mathstudent55

The sum of the measures of the angles of a triangle is 180 degrees.
All three angles must add to 180.
You were given the measures of two angles.
Add them up. Then subtract the sum from 180, and that is the measure of the third angle.

- mathstudent55

We'll do it quickly.
What is 62 + 35 = ?

- anonymous

97

- mathstudent55

Great.
62 + 35 = 97
Now subtract the sum 97, from 180.
What is 180 - 97 = ?

- anonymous

83

- mathstudent55

Correct.
To double check, just add:
Is 62 + 35 + 83 = 180?
Yes, it is, so 83 is correct.

- mathstudent55

Ok, gtg. I'll be back in a few hours.

- anonymous

ok thx so much!

- mathstudent55

You're welcome.
If you see me on OS again and have any questions on math, just tag me or message me,.

- mathstudent55

Bye.

- anonymous

ok bye

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