A triangle is a three-edged polygon with three vertices. The measure of arc AB is 72°. Thus, the correct option is C.
What is a triangle?
A triangle is a three-edged polygon with three vertices. It is a fundamental form in geometry. The sum of all the angles of a triangle is always equal to 180°.
Since in the ΔAOB, the length of the side OA and OB are,
OA = OB = radius
Therefore, the triangle is an isosceles triangle. Thus, we can write,
∠OAB = ∠OBA = 54°
Now, the sum of all the angles of ΔAOB is,
∠AOB + ∠OAB + ∠OBA = 180°
∠AOB + 54° + 54° = 180°
∠AOB = 72°
Hence, the measure of arc AB is 72°. Thus, the correct option is C.
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