Odpowiedzi

2009-12-17T17:31:30+01:00
A) PΔ = 3 x 4/2 = 12/2 = 6
6 = 5 x a/2
5 x a = 12
a = 12/5
a = 2,4 cm

b)PΔ = 5 x 9/2 = 45/2 = 22,5 cm²
22,5 = 7 x b/2
7 x b = 45
b = 45/7 = 6 i 3/7

c) P = 3 x 5/2 = 7,5
7,5 = 2 x c/2
15 = 2 x c
15/2 = 7,5
c = 15/2 = 7,5 cm
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