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R=5
r=3
g=13
la formula del Area del tronco de cono es:
At= π[g(R+r)+R²+r²]
Ahora reemplazamos:
At= π [13(5+3)+5²+3²]
At= π [13 x 8+25+9]
At= π [104+25+9]
At= π [138]
--> At= 138π
..listo!