Question

calculate the surface area of a cone whose slant height is 21 metre and diameter of base is 24 metre​

Answer 1

Answer:

567

$\setlength{\unitlength}{1 cm}\begin{picture}(0,0)\thicklines\put (1,0){\line (2,3){2}}\put (5,0){\line (-2,3){2}}\put(2.85,3.2){\bf A}\put(0.5,-0.3){\bf C}\put(5.2,-0.3){\bf B}\put (1,0){\line (5,0){4}}\put (2,1.5){\line (1,0){2}}\put (1.5,1.5){\sf D}\put (4.2,1.5){\sf E}\put (1,0){\line (2,1){3}}\put (5,0){\line (-2,1){3}}\end{picture}$

Answer 2

1244.57 m square

Step-by-step explanation:

slant height = 21 m

diameter of base = 24 m

Hence the Radius will be = 12 m

TSA = pi*r*l +pi*r square

= 1244.57 m square