Răspuns :
A----------B------------C----------D------------E
AB+BC+CD+DE=90mm transform 2 cm=20mm
20mm+25mm+X+25mm= 90mm
70mm+X=90mm
X= 90mm-70mm
X=20mm
AB+BC+CD+DE=90mm transform 2 cm=20mm
20mm+25mm+X+25mm= 90mm
70mm+X=90mm
X= 90mm-70mm
X=20mm