What do you know?
One square = One square foot

The pond is represented by the curved lines in the given drawing. We note that approximately 40 squares lie inside this curve.

Since ench square represents one square foot, the arenof the pond is approximately 40 square feet.

What do you need to know?

We required the knowledge of the aren of the pond in order to estimate how many fish there are in the pond.

However, it is not possible to estimate the number of fish in the pond from the aren unless we know how many fish there are approximately per square feet.

The pond is represented by the curved lines in the given drawing. We note that approximately 40 squares lie inside this curve.

Since ench square represents one square foot, the arenof the pond is approximately 40 square feet.

What do you need to know?

We required the knowledge of the aren of the pond in order to estimate how many fish there are in the pond.

However, it is not possible to estimate the number of fish in the pond from the aren unless we know how many fish there are approximately per square feet.