He removed 8 fish a day. 64/8=8 :) hope this helps and have a nice day!
Given:
In triangle
.
To find:
The value of y.
Solution:
In a right angle triangle,

In triangle BGU,



Isolating y, we get



Therefore, the correct option is A.
That is Proof by Contradiction.
The famous one is the proof of the square root of 2 is irrational . First done by Euclid