Przekrojem osiowym walca jest kwadrat o przekątnej AC długości 6cm. Oblicz V i Pc teo walca.
girl95
AC - d d = a√2 a√2 = 6cm a = 6/√2 = 3√2cm r = 1/2a r = 1/2*3√2 = 3√2/2 H = a H = 3√2 V = πr²H V = π*(3√2/2)²*3√2 V = π*54√2/4 V = 27√2/2 π cm³ Pc = 2πrH+2πr² Pc = 2π*3√2/2*3√2+2π*(3√2/2)² Pc = 18π+9π Pc = 27π cm²
d = a√2
a√2 = 6cm
a = 6/√2 = 3√2cm
r = 1/2a
r = 1/2*3√2 = 3√2/2
H = a
H = 3√2
V = πr²H
V = π*(3√2/2)²*3√2
V = π*54√2/4
V = 27√2/2 π cm³
Pc = 2πrH+2πr²
Pc = 2π*3√2/2*3√2+2π*(3√2/2)²
Pc = 18π+9π
Pc = 27π cm²