# Algebra

posted by .

The Circumference and area of a circle of radius r are givin by 2 [pie] r and [pie] r[2], respectively use 3.14 for the constant [pie]

A. What is the circumference of a circle with a radius of 2 m?

B.What is the area of a circle with a radius of 2 m?

C. The earth has a radius of about 3960 miles. Approximately how long is the equator?

• Algebra -

Solve these problems.

A. C = 2*2*3.14

B. A = 3.14*2*3.14*2

C. C = 3.14*2*3960

• Algebra -

A. C = 12.14?

B. A = 18.84. 28?

C. C = 24868.8?

• Algebra -

A. Please do the multiplication again. You're close but not right.

B. I mistyped the formula above. It should be:
A = 3.14*2*2

C. You're right! :-)

• Algebra -

A. C= 12.56

B. A= 12.56

C. Alright!

• Algebra -

Yay! You have all of them right now. The only addition is that the answer to B is 12.56 square meters.

## Similar Questions

1. ### math

how do i solve the problem what is the radius of a circle with a circumference of 24 pie
2. ### geometry

how do you find the circumference of a circle with the area of 169 pie m squared(in the terms of pie)?
3. ### math

Mrs.penn has a circular tablecloth with a circumference of 29 feet. Which expression could be used ro find the radius of the tablecloth?
4. ### AP Calculus

The radius of a circle is decreasing at a constant rate of 0.1 centimeters per second. In terms of the circumference C, what is the rate of the area of the circle, in square centimeters per second?
5. ### Math

The radius of a circle is decreasing at a constant rate of 0.1 centimeters per second. In terms of the circumference C, what is the rate of the area of the circle, in square centimeters per second?
6. ### AP Calculus

The radius of a circle is decreasing at a constant rate of 0.1 centimeters per second. In terms of the circumference C, what is the rate of the area of the circle, in square centimeters per second?
7. ### Math

Find the rate of change of the area of a circle when its radius is 18.0 m and the radius is changing at the rate of 10.1 cm/s?
8. ### math algebra?

A circle has circumference of 56.52 ft. What is its area?
9. ### Math

A circle has an area of pie cm square what is its circumference in terms of pie
10. ### math

the radius of semi circle is 30 cm.Find its circumference Note:what formula can i use (pie*r + 2r) or (pie*r + r)

More Similar Questions