To calculate the area of the frustum of a cone, separate the shape into the following three elements, with their respective areas:
The larger base: A₁ = π × R²;
The smaller base: A₂ = π × r²; and
The side of the frustum: As = π × S × (R + r);
The area of the frustum of a cone is:
A = A₁ + A₂ + As = π × (R² + r² + S × (R + r)) Read more