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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