c=(a+b)*2

S=a*b square

c=a*4

s=a^2

column

s=

2∏rh+∏r*2

v=∏r*2h

The area formula of the cone is: S=(L 1)*(L2)*( 1/2).

Where L 1 is the length of the bus (that is, the distance from the top of the cone to the bottom excircle), and L2 is the circumference of the bottom excircle. . . Volume: V=( 1/3)*S*H

Where s is the area of the bottom circle and h is the distance from the top to the bottom. . . The formula of sector area is the corresponding angle multiplied by the total area of the circle where the sector is located, and then divided by 360.