geometry formulas for area and perimeter of shapes

Truncated cone

circle area and perimeter formula
$$\textbf{Volume of the truncated cone}$$
$$V = \frac{1}{3} \pi h (a^2 + a b + b^2) $$
$$\textbf{Curved surfaced of the truncated cone}$$
$$O = \pi (a + b) \sqrt{h^2 + (b-a)^2} = \pi (a + b) c$$
$$\textbf{Total surface area of the truncated cone}$$
$$O = \pi (a + b) \sqrt{h^2 + (b-a)^2} + \pi (a^2 + b^2) $$
$$= \pi (a + b) c + \pi (a^2 + b^2)$$