Posted by Elizabeth on Saturday, March 13, 2010 at 1:14pm.
Find the area of the circle described. Use pi= 22/7.
Diameter= 1.4cm
Please help!

7th Grade Math  Ms. Sue, Saturday, March 13, 2010 at 1:21pm
Area = pi * r^2
Radius = 0.7 or 7/10
A = 22/7 * 49/100
A = 1078/700
A = 1 54/100 = 1 27/50 square centimeters

7th Grade Math  shr=er, Sunday, March 14, 2010 at 4:39am
the circumference of a circle and the perimeter of a square are both 40 cm. which has a greater are.the circle or the square?find the circumference

7th Grade Math shr=er  PsyDAG, Sunday, March 14, 2010 at 12:03pm
First, if you have a question, it is much better to put it in as a separate post in <Post a New Question> rather than attaching it to a previous question, where it is more likely to be overlooked.
Second, you have already stated the circumference of the circle.
If the perimeter of a square = 40 cm, each side must 10 cm, giving you an area 10*10 = 100 cm.
Circle circumference = π d = 40, where d = diameter
Therefore d = 40/π
Circle area = 1/4 π d^2 = 1/4 π (40/π)^2
Insert d value from first equation into the second, solve for area and compare to square area.

7th Grade Math  hello, Wednesday, March 24, 2010 at 7:19pm
if its the diamater you just cut that in half to make the radius then you do that times pie which is 3.14 or 22/7. you welcome(:
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