BBC6 年
How to prove a cone's surface area = π × r × slant length
the bottom edge of the rectangle is 1/2 of the circumference of the base of the cone. The height of the rectangle is the slant length... Image caption, ...you've done it! The sectors rearranged ...
BBC1 年
How to show a cone's surface area = π × r × slant length
the bottom edge of the rectangle is 1/2 of the circumference of the base of the cone. The height of the rectangle is the slant length... Image caption, ...you've done it! The sectors rearranged ...