Suppose you want to know how many fish live in a lake. How can you count the fish population
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Use capture-recapture sampling method. My prof created this program for such cases and it's pretty cool. Throw a stick of dynamite into the lake and then count the corpses Find the average number of fish per unit of volume and then multiply by the size of the lake.

circle area = pi * radius^2

if diameter = 10 then radius = 5

circle area = pi * 5^2

circle area = pi * 25

circle area = 78.5398163397 square units

step-by-step explanation: