The inferior vena cava (also known as IVC or the posterior vena cava) is a large vein that carries oxygen-depleted blood from the torso and lower body to the right side of the heart. From there the ...

It may also be helpful to understand π (pi) and the circumference of a circle. The formula for the area of the circle is 𝑨 = π𝒓². To work out the area of a circle: Find the value of the ...