BBC1 个月
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 ... into the rectangle show the area of the curved surface 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 ... into the rectangle show the area of the curved surface of ...