1. I'm sorry, I cannot see the image you are referring to.
2. I'm sorry, I cannot see the image you are referring to.
3. I'm sorry, I cannot see the image you are referring to.
4. The red line around the circle represents the circumference.
5. The shaded green area inside the circle represents the area.
6. The black dot in the circle represents the center.
7. An infinite number of points all equidistant to a central point are called a Circle.