4.
ABC~MNP =>
[tex] \frac{ab}{mn} = \frac{bc}{np} = \frac{ca}{mp} [/tex]
[tex] \frac{42}{14} = \frac{bc}{8} = \frac{36}{mp} [/tex]
[tex]bc = \frac{42 \times 8}{14} = \frac{21 \times 8}{7} = 3 \times 8 = 24[/tex]
[tex]mp = \frac{36 \times 14}{42} = \frac{36 \times 2}{6} = 6 \times 2 = 12[/tex]
5.
ABC isoscel de bază BC => B=C=(180-A):2=(180-44):2=136:2=68°
MNP isoscel de bază NP => P=N=68°
P=C
N=B => (din U.U.) ABC~MNP
6.
ABC isoscel de bază BC => B=C=72° A=180°-72-72=180-144=36°
BD- bisectoare=> ABD=CBD=72:2=36°
ABD=BAC
C=C => (din U.U.) ABC~BDC
7.In poză
