The area of the washer will be the area of the smaller circle SUBTRACTED from the area of the larger circle.
Area of a circle = pi * r^2 where r is your radius (which is half the diameter).
Larger circle area = pi *(diameter/2) ^2.
Smaller circle area = pi * (13.2/2)^2 = pi * 6.6^2 = 136.8484....
So...the area of the washer = larger circle area - 136.4848...
The scale factor is 5/3
9(5/3) = 15
Answer:
x = 4 or x = -4 is your answer
5. y = x + 7
6. y = -x + 1
Well 24=4*6, and 35=7*5 not 6, so 4/7 doesn't = 24/35, so no
