On the first figure, given that:
Radius of cone, r = 10 units
Height of cone, h = 10 units
The formula to find the surface area of cone is
Plug the values into the formula.
The surface area is 758 square units.
On the second figure, given that:
Radius of cone, r = 12 units
Height of cone, h = 8 units
The formula to find the surface area of cone is
Plug the values into the formula.
The surface area is 996 square units.
On the third figure, given that:
Radius of cone, r = 16/2 units = 8 units
Height of cone, h = 15 units
The formula to find the surface area of cone is
Plug the values into the formula.
The surface area is 628 square units.
On the fourth figure, given that:
Radius of cone, r = 12/2 units = 6 units
Height of cone, h = 21 units
The formula to find the surface area of cone is
Plug the values into the formula.
The surface area is 525 square units.