Odpowiedzi

2009-11-16T17:59:46+01:00
P = 1/2*a*h
13 cm2 = 1/2*8*h
13 cm2= 4* h
h = 13:4
h = 3,25.
Spr: 1/2*8*3,25 = 13 cm2.
2009-11-16T18:04:07+01:00
1/2a*b
1/2*8cm*a=13cm8
8cm*a=13cm2*2
8cm*a=26cm2
a=26cm2:8cm
a=3,25cm