OPTIMIZE Fill in the blanks to make true statements. Write the answers in your notebook. of the 1. The point that is exactly in the middle of a circle is the circle. 2. Half the diameter of a circle is called 3. 4. The longest chord of a circle is called An angle formed by two radii with the center of the circle as the vertex is called a 5. A region bound by a chord and an arc of a circle is called a​