The circumference of a circle is 6.28. What is the area of the circle?

4 Answers
Sep 8, 2016

Area #~~ 3.14# (sq.units)

Explanation:

Circumference: #2pir=6.28 rarr r=3.14/pi#

Area: #pir^2 = pi*(3.14^2)/(pi^2) = (3.14^2)/(pi)#

Using the approximation #pi=3.14#
Area: #(3.14^2)/3.14 = 3.14#

Sep 8, 2016

Area of circle is #3.14#

Explanation:

If #r# is the radius of a circle

its circumference is #2pir# and area of circle is #pir^2#, where #pi=3.14#

Hence as circumference is #6.28#

#2xx3.14xxr=6.28# or

#6.28xxr=6.28# i.e, #r=1#

Hence area of circle is #pir^2=3.14xx1^2=3.14xx1=3.14#

Sep 8, 2016

The area of the circle is #3.14 sq.unit#

Explanation:

The circumference of a circle is #2*pi*r#
The area of a circle is #A=pi*r^2# where #r# is the radius of the circle. #r=6.28/(2*pi)=1 :. A=pi*1^2=3.14 sq.unit#[Ans]

Nov 1, 2016

Area of the circle is #3.14#

Explanation:

Let the radius of the circle be #r#.
#:.#Circumference #=2pir=6.28#
#:.pir=3.14#
#:.r=3.14/pi=1.# [ #pi=3.14#].
#:.r=1.#

Now Area #=pir^2=pi*(1)^2=pi=3.14#

#:.#Area of the circle is #3.14# (answer).