przekrój osiowy walca jest kwadratem o polu 128 cm kwadratowych . oblicz pole powierrzchni całkowitej walca
P = 128 cm² P = a² a² = 128 a = √128 a = 8√2 cm a = średnica r = średnica/2 r = 8√2 /2 = 4√2 H = a Pc = 2πrH+2πr² Pc = 2π*4√2*8√2+2π*(4√2)² Pc = 2π*32*2+2π*16*2 Pc = 128π+64π Pc = 192π cm²
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P = 128 cm²
P = a²
a² = 128
a = √128
a = 8√2 cm
a = średnica
r = średnica/2
r = 8√2 /2 = 4√2
H = a
Pc = 2πrH+2πr²
Pc = 2π*4√2*8√2+2π*(4√2)²
Pc = 2π*32*2+2π*16*2
Pc = 128π+64π
Pc = 192π cm²