In a circle, AB and CD are diameters. Which of the following must be true?

I. The length of arc ABD is equal to the length of arc BAC

II. AB is perpendicular to CD

III. ACBD is a square

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I. The length of arc ABD is equal to the length of arc BAC

II. AB is perpendicular to CD

III. ACBD is a square

## Comments (2)

i was confused about this question because the ordering of the arc. shouldn’t it be arc ACB, not BAC? for arc BAC, the points are not in order so I was confused.

Trust the orders given. These are very long arcs. Almost all the way around the circle.