<span>lengths are in ratio 1:3
areas are in ratio
1 : 3</span>²<span> = 1: 9
area of ADG = 9 x 42 = 378 </span>
The formula to find the circumference of a circle is :

To find the radius we would divide 3.3 by 2
The radius is always HALF of the diameter.
3.3/2=1.65
Now we know r=1.65
So we plug that into the circumference formula:

pi=3.14
Once you multiply all the numbers together you get:
C=10.36m
<span>Amplitude: 3; period: pi/2; midline: y = 2</span>