How to calculate the colored mountain area of Yin Xi Reservoir with only stones?

Generally, a mountain can be regarded as a cone with a surface area of S = 4 * π * (R 2) and a volume of V = 4/3 * π * (R 3). However, it is normal to look at the forest right certificate, and the slope area and vertical projection area can be calculated according to the needs of mountainous areas.

In the process of land requisition (utilization), the vertical projection area is adopted. An acre is about 667 square meters. Normal is to look at the forest right certificate, otherwise it is calculated according to the following formula:

Surface area:

S = 4 * pi * (r 2) s surface area π ππππππr circle diameter 2 square.

Volume:

V = 4/3 * π * (R 3) V volume π π π π π π is 3 cubic meters larger than the diameter of R circle.

Mountain area can be calculated according to the need of slope area and vertical projection area. In the process of land expropriation, the vertical projection area is adopted.