Question

If slant height of the cone is 21cm and diameter of base is 24 cm .the total surface area of cone is

Answer 1

Total surface area of a cone can be determined by the equation,

T.S.A = πrl + πr²

Given,

• Diameter (d) = 24  cm
• Radius (r) = $\frac{24}{2}$ = 12 cm
• Slant height(l) = 21 cm
• π = 3.14

Applying the values to the equation,

$\bold{T.S.A. = (3.14\times12\times21)+(3.14\times12^2)}$

$\implies{\bold{T.S.A. = 791.28+452.16}}$

$\boxed{\bold{T.S.A.=1243.44 m^2}}$

Answer 2

Answer:

answer is 1244.57sq.cm