BBC1 年
How to show the surface area of a sphere is 4πr²
The orange should be as round as possible, so the peel represents the surface area of a sphere. STEP 2: Repeat this 3 more times. You should now have 4 identical circles. Each circle has area ...
BBC3 年
What is the volume of a cone, a sphere and a cylinder?
A cone is a 3D shape with 2 faces and one edge A sphere is a 3D shape ... of a cylinder is π × r² × l (r is the radius of the circle and l is the length of the cylinder).