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# I have a homework question, I admit, No, I am not smarter than a 5th grader!

I asked a home work question once before and got a bunch of "My child never has issues with home work....My child is able to do his own work and blah, blah, blah...."
Good for you, now get lost unless you can really help me here!!

OK, I don't have any f****ing clue how to do this(Yes, I did go to college, and yes it has been over 15 years since I have been in school(college) so cut me some slack here!)

The circle has a radius of 40 mm. What is the diameter of the circle in CENTIMETERS?

How do I explain this to him? ARRRRRRRRRGHHHHHH!!!!!!! I HATE IT WHEN HE HAS MATH HOMEWORK!!!!!!!!!!!!!!!!!!!!!!

Asked by Starfire73 at 5:26 PM on Jan. 26, 2010 in Tweens (9-12)

Level 4 (30 Credits)
• Honestly, I was never good at converting to other forms of measurment.

And mom's shouldn't judge others. I myself never had issues in school until High School and it was all with math. Not everything just "clicks" in childrens brains.

Good Luck!

Answer by Anonymous at 5:30 PM on Jan. 26, 2010

• 40 mm = 4cm
The diameter is 2 times the radius.

Answer by SleepingBeautee at 5:32 PM on Jan. 26, 2010

• Believe it or not this is grade school math!!!!

Thanks Sleeping beautee!

Answer by Starfire73 at 5:33 PM on Jan. 26, 2010

• One mm is one "millimeter" or one one-thousandth of a meter (1 mm = 1/1000 m).

One cm is one "centimeter" or one one-hundredth of a meter (1 cm = 1/100 m).

Therefore, 1 cm = 10 mm. To convert mm to cm, divide the number of mm by 10 to get the number of cm.

then
the diameter of a circle is twice as long as the radius.

Answer by charlotsomtimes at 5:36 PM on Jan. 26, 2010

• 2r=d 2(40)=80mm....
80. Move deci ovr 1 place 2 the left (cuz ur goin bigr from mm 2 cm....) so 8.0.....I figured out with my ged book... u can have it if u want it hope it helps

Answer by muthrof_2 at 5:44 PM on Jan. 26, 2010

• 40 mm = 4cm
The diameter is 2 times the radius.

This is it.

Answer by armywife2009101 at 5:45 PM on Jan. 26, 2010

• OK I was all set to help you until I saw it was math.  Sorry, I am the weakest link!

Answer by beeky at 7:50 PM on Jan. 26, 2010

• lol

Answer by Starfire73 at 10:51 PM on Jan. 26, 2010

• The pp got it, but never be ashamed to ask a question. I tutor math and I've noticed that people have almost a phobia of it that gets in the way. They freeze. Just relax, read the answers above and you now know how many mm are in a cm, and that a diameter (unrelated to mm and cm) is like cutting a pie in half. The radius is half of the diameter.

Answer by MonicaE521 at 1:25 PM on Jan. 27, 2010

• I may be pm'ng you in the near future Monica!!!

Answer by Starfire73 at 4:10 PM on Jan. 27, 2010

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