Odpowiedzi

2010-02-24T16:10:41+01:00
A - 3 cm
b - 4cm
c - 5 cm

H - 10cm

pc= 2pp + pb
pp = 1/2 a x b
pp = 6 cm
pb = a * h + b * h + c * h = 30 + 40 + 50 = 120 cm^2
pc = 12 cm ^2 + 120 cm^2 = 132 cm^2
prosze
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8 4 8
2010-02-24T16:11:42+01:00
Pc= 2*Pp+Pb

Pp=a*h/2
Pp=4*3/2
Pp=6 cm²

Pb₁=a*h
Pb₁=3*10= 30 cm²

Pb₂=4*10=40 cm²

Pb₃=5*10=50 cm²

Pb=30+40+50=120 cm²

Pc=2*6+120
Pc=132 cm²
10 5 10
2010-02-24T16:14:41+01:00
Pc - pole całkowite
Pb - pole boczne

Pc = 2 * Pp + Pb
Pp = 3 cm * 4 cm
Pp = 12 cm kwadratowe
Pb = 4 * 10 + 3 * 10 + 5 * 10
Pb = 40 + 30 + 50
Pb = 120 cm kwadratowe

Pc = 2 * 12 cm kwadratowe + 120 cm kwadratowe
Pc = 24 cm kwadratowe + 120 cm kwadratowe
Pc = 144 cm kwadratowe

Odp: Pole tego graniastosłupa wynosi 144 cm kwadratowe.
7 2 7