Odpowiedzi

2010-03-30T19:12:46+02:00
I bok - x
II bok - x+5

2(x+x+5) = 24 |:2
2x+5 = 12
2x = 12-5
2x = 7 |:2
x = 3,5

I bok - 3,5
II bok - 3,5+5 = 8,5

P = 3,5*8,5
P = 29,75
2010-03-30T19:14:31+02:00
Bok a = x-5cm
bok b = x cm

24 cm= 2x+ 2*(x-5)
24 cm=2x+2x-10
24 = 4x-10 /+10
34=4x
x=8,5cm

bok a= 3,5 cm
bok b= 8,5 cm
p=a*b
p=3,5*8,5
p=29,75 cm²