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99%
The circumference of a circle equals 2πr.
Tier 2: Mathematical Derivation
99%
Negative numbers multiplied together yield a positive result.
Tier 2: Mathematical Derivation
99%
A googol is 10 raised to the power of 100.
Tier 4: Definition
99%
The sum of angles in a quadrilateral is 360 degrees.
Tier 2: Mathematical Derivation
99%
An equilateral triangle has all sides of equal length.
Tier 4: Definition
99%
The factorial of 5 (5!) equals 120.
Tier 2: Mathematical Derivation
99%
Parallel lines never intersect in Euclidean geometry.
Tier 4: Definition