Why Greek 3 Problems Restrict Using Only Unmarked Ruler and Compass

The 3 ancient Greek Problems are:
1. Trisect a Triangle
2. Square a circle
3. Doubling a Cube

Why restrict using only unmarked ruler ?
Answer: Using a Straight line: \boxed{ y = mx + c }

Why a compass?
Answer: Using a Circle: \boxed{ x^2 + y^2 = r^2 }

The 3 Greek Problems have been proven by 19th Century impossible to solve with only a straight line and a circle.

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