stylistic:tone
Surface area

The lateral surface area of a right circular cone is L S A = π r ℓ {\displaystyle LSA=\pi r\ell } where r {\displaystyle r} is the radius of the circle at the bottom of the cone and ℓ {\displaystyle \ell } is the slant height of the cone. The surface area of the bottom circle of a cone is the same as for any circle, π r 2 {\displaystyle \pi r^{2}}. Thus, the total surface area of a right circular cone can be expressed as each of the following: