37.7 units2
The lateral surface area of a right circular cone with a radius of 12cm and a slant height of 20cm is approximately 754cm2
Uisng the lateral area and tha radius, you should be able to find the height of the cone. Using the height and radius as the legs of a right triangle, use the Pythagorean Theorem. The hypotenuse is the slant height.
3
Why do you need to FIND the slant height if you have the [lateral height and] slant height?
pi x radius x slant height
The lateral surface area is 18.85 square inches.
The slant height cannot be larger than the base radius.
LA= πrsLA=piRS
The lateral area... Apex :)
The lateral surface area is A = pi*(radius)*(slant height), where (slant height) = sqrt(r^2 + h^2). So A = pi*(5 in)*sqrt((5 in)2+(19 in)2) = 308.6125 square inches
The surface area is a function of the height (or slant height) and the radius of the base. So, the slant height is a function of the surface area and the base-radius. Since the latter is unknown, the slant height cannot be calculated.
The lateral area is, I think, 35pi and the surface area is 60pi.188.40 units sq.