If a perpendicular cut is made from a point on the circumference of the base to the vertex and the cone is opened up, a sector of a circle with radius is produced. Since the circumference of the base of the cone is , therefore the arc length of the sector of the circle is .
slant height of the cone
radius of the base of the cone
Total Surface Area
The total surface area area of curved surface area of base
The curved surface area of a right circular cone equals the perimeter of the base times one-half slant height.
The total surface area equals the curved surface area of the base.
The slant height of a conical tomb is m. If its diameter is m, find the cost of cleaning it at $2 per cubic meter and also the cost of whitewashing the curved surface at cents per square meter.
Now, slant height, m
Perpendicular height m (as )
Volume of the conical tomb
Cost of construction
Curved surface square meters
Cost of white washing dollars