The surface area of the cone = the side area of the cone+the area of the bottom circle.
Where: the side area of the cone =πRL.
Total area of cone =πRl+πR2
π is pi 3. 14.
R is the radius of the circle at the bottom of the cone.
L is the generatrix length of the cone (note: it is not the height of the cone)
The formula for calculating the sector area is S=n/360πr2.