Question

What is the pair of figures we would get if we cut open a right circular cone of radius $r$ and slant height $l$?

• A.
• B.
• C.
• D. None of the above

Answer 1

The correct option is C

The following pair of figures is obtained when we cut open a right circular cone of radius $r$ and slant height $l$ :

The slant height of the cone is the radius of the sector. The circumference of the base of the cone is the arc length of the sector.