If a circle is inscribed in a square, which of the following must be true?
AThe square is circumscribed about the circle.
BEach vertex of the square lies inside the circle.
CThe circle is congruent to the square.
DEach vertex of the square lies outside the circle.
EThe circle is tangent to each side of the square.
AThe square is circumscribed about the circle.
BEach vertex of the square lies inside the circle.
CThe circle is congruent to the square.
DEach vertex of the square lies outside the circle.
EThe circle is tangent to each side of the square.