A circular pool 12.4 feet in diameter is surrounded by tile walk 2.1 feet wide.
find the area of the walk to the nearest tenth.
What i did:
Where did i go wrong?
This picture may help:
Remember that we want to find the area of the walk, that is the shaded area in the picture.
You found the area of a circle with a radius of 8.3 .
Below is the full answer......
area of walk = area of outer circle - area of inner circle
radius of inner circle in feet = 12.4 / 2 = 6.2
area of inner circle in sq feet = pi * 6.22 = 38.44pi
radius of outer circle in feet = 6.2 + 2.1 = 8.3
area of outer circle in sq feet = pi * 8.32 = 68.89pi
area of walk in sq feet = 68.89pi - 38.44pi = 30.45pi ≈ 95.7