Answer:
Step-by-step explanation:
Since area of a circle is pi.r^2
We know that diameter is 20
Radius is half of diameter
So it becomes
Pi.(d/2)^2
So pi.(40/4) is the area of this circle.
Or 40pi/4
Answer:
20 cm
Step-by-step explanation:

1. Multiply the actual depth my the scale factor of 1/15.
2. Multiply the resulting depth after multiply by the scale factor by the conversion factor of meters to centimeters.