BBC29 天
How to show a cone's surface area = π × r × slant length
to create a cone, use the ruler to draw two lines outwards from the centre point of the circle - both at slight angles as above. Use the scissors to cut along the lines. Take the bottom part of ...
BBC6 年
How to prove a cone's surface area = π × r × slant length
to create a cone, use the ruler to draw two lines outwards from the centre point of the circle - both at slight angles as above. Use the scissors to cut along the lines. Take the bottom part of ...