Answer:
Total surface area of the cone = 208.81 sq cm
explanation
Diameter of the cone (d) = 7 cm
Slant height (L) = 15.5 cm
1) The radius of the cone= Half of the diameter
= 7/2 cm = 3.5 cm
⇒ r = 3.5 cm
Now, Total surface area of the cone =
taking π = 3.14
We get
and πrl = 3.14 x 3.5 + 15.5 = 170.345
So, Total surface area of the cone = 38.465 + 170.345 = 208.81 sq cm