Answer:

Step-by-step explanation:
The formula of an area of a circle:

r - radius
Circle A:
radius = 4 ft. Substitute:

Circle B:
radius = 9 ft. Substitute:

The ratio:

Answer:
b=-0.8
Step-by-step explanation:
90-b=90.8
b=90-90.8
b=-0.8
All 3 angles have to add up to be 180 so the answer would be 90