Question

ajudem geometria...........

Answer 1

1. At = 2*π*r*h + 2π*r^2 
    At = 2*π*4*8 + 2π*4^2=200,96+100,48=301,44 cm^2

V = π*r^2*h= π*4^2*8=401,92cm^3

2. h=5cm  r=2cm e g=raizr^2+h^2=raiz2^2+5^2=raiz 34=5,83cm
 At =π*r^2+ π*r*g
  At =π*2^2+ π*2*5,83=12,56+36,61=49,17cm^2

V=1/3π*r^2.h=1/3*π*2^2*5=20,93 cm^3

3. V=abc=6*8*4=192cm^3

dp=raiz a^2+b^2+c^2=raiz6^2+8^2+4^2=raiz116=10,77cm^2

At=2( ab + ac + bc)= 2( 8*6 + 8*4 + 6*4)=2*104=208 cm^2