Odpowiedź:
z.1
a = 5 cm
Pb = 3 a*h = 3*5*h = 15 h = 155 / : 15
h = [tex]\frac{155}{15} = \frac{31}{3} = 10 \frac{1}{3}[/tex]
h = 10 [tex]\frac{1}{3} cm^2[/tex]
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z.2
h = 8 cm
4 a = 24 cm więc a = 6 cm
V =Pp*h = a²* h = 36*8 = 288
V = 288 cm²
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z.3
Pc =2 Pp + Pb = 2*0,5* 8 cm * 6 cm + 4*5 cm*h = 208 cm²
48 cm² + 20 h = 208 cm²
20 h = 208 cm² - 48 cm² = 160 cm² / : 20
h = 8 cm
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Szczegółowe wyjaśnienie:
