Area of a circle =πr2 Where r= radius of the circle. Circumference of a circle =2πr Circumference =440m 440m=2πr π=
22
7
440m=2×
22
7
×r Solve for the value of r radius which is needed to calculate for the area of the circle. Get rid of the fraction by multiplying both sides of the equation by the denominator (7). 440×7=2×22×r Divide both sides of the equation by 2×22 to make r the subject r=
440×7
2×22
22 divides 440,20 times and itself once. 2 divides itself once and 20,10 times. r=10×7 Substitute the value of r in the area equation to calculate for the area Area =πr2 r2=r×r Area =π×r×r π=
22
7
r=10×7 Area =
22
7
×10×7×10×7 Note: The denominator 7 cancels one of the 7 s Area =22×10×7×10 Area =15,400m2