Odpowiedzi

2009-12-02T18:54:44+01:00
Pt= a*h/2

Pt= 21*8/2
Pt= 84 cm2
h=a√3/2
h2= 17√3/2 = √216.75
h3= 10√3/2 = √75
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2009-12-02T19:05:01+01:00
Pt= a*h/2

Pt= 21*8/2

Pt= 84 cm2

h=a√3/2

h2= 17√3/2 = √216.75

h3= 10√3/2 = √75
2009-12-02T19:11:52+01:00
ABI=21 cm , IBCI=17 cm , ICAI=10 cm , ICDI=8 cm
P=½IABI*ICDI
P=½*21*8
P=84 cm²

P=½BCI*IAEI
84=½*17*IAEI
IAEI=84:8,5
IAEI=9 i 15/17 cm

P=½IACI*IBFI
84=½*10*IBFI
84=5*IBFI
IBFI=84:5
IBFI=16,8 cm
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