Question

From a solid cone of height 16 cm and radius 12 cm a conical cavity of height 3 cm and base radius 4 cm is hollowed out such that the base of the cone forms concentric circle find he total surface area of the solid

Answer 1

Answer:

1218.32 CM²

Step-by-step explanation:

H = 16CM

R=12CM

h=3CM

r=4CM

L=√H²+R²

=√256+144

=20CM

l=√h²+r²

=√16+9

=5CM

TSA OF SOLID= CSA OF BIGGER CONE+  CSA OF CONE + π(R²-r²)

= πRL+πrl+π(144-16)

= π[ 12*20+4*5 +128]

=3.14[240+20+128]

=3.14*388

=1218.32 CM²

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