Question

Ex 12. Îmi trebuie urgent!

Answer 1

12)
a) AM=AB:2
AM=6cm:2
AM=3cm
NC=BC:2
NC=4cm:2
NC=2cm
MN=MB+BN
M mijlocul lui AB⇒AM≡MB=3cm
N mijlocul lui BC⇒BN≡NC=2cm
MB=3cm+2cm
MB=5cm
b)
AB=AM+MB
M mijloclu lui AB⇒AM≡MB=2cm
AB=2cm+2cm
AB=4cm
BC=BN+NC
BN=MN-MB
BN=5cm-2cm
BN=3cm
N mijlocul lui BC⇒BN≡NC=3cm
BC=3cm+3cm
BC=6cm
AC=AB+BC
AC=4cm+6cm
AC=10cm
c)
NC=AC-AN
NC=10cm-6cm
NC=4cm
BC=BN+NC
N mijlocul lui BC⇒BN≡NC=4cm
BC=4cm+4cm
BC=8cm
AB=AC-BN
AB=10cm-8cm
AB=2cm