First slide

Cartesian plane

Question

Which of the following sets of points form an equilateral triangle?

Easy

A

(1, 0), (4, 0), (7 , -1)
B

(0, 0), (3/2, 4/3), (4/3,3/2)
C

(2/3, 0), (0,2/3), (1,1)
D

None of these

Solution

For the equilateral triangle, one vertex must be an irrational point.

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