Noah is baking a two-layer cake, in which the bottom layer is a circle and the top layer is a triangle. segment AB = 10 inches and arc AB ≅ arc AC, what does Noah know about the top layer of his cake?


Circumscribed circle D around triangle ABC, arcs AB and AC are congruent.


segment AB is twice the length of segment AC because their arcs are congruent; therefore, ΔABC is an isosceles triangle.
segment AB ≅ segment AC because their arcs are congruent; therefore, ΔABC is an isosceles triangle.
segment AB is twice the length of segment AC because their arcs are congruent; therefore, ΔABC is an equilateral triangle.
segment AB ≅ segment AC because their arcs are congruent; therefore, ΔABC is an equilateral triangle.