Which point is on the circle centered at the origin with a radius of 5 units? Distance formula: square root of open paren x sub 2 minus x sub 1 close paren squared plus open paren y sub 2 minus y sub 1 close paren squared end root

A point is on a circle centered at the origin with radius 5 if its distance from (0, 0) is 5. For (2, √21), the distance is √(2² + (√21)²) = √(4 + 21) = √25 = 5. The other points do not have distance 5 from the origin.

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