b) <)A =180 -(45+45 ) =180-90=90 grade +> ABC = triunghi drept. isoscel
c) AD _l_ BC =>AD = inaltime , mediana, mediatoare, bisectoare
<) CAD = 90-45 =45 gr. ( triungh. ADC = drept. isoscel)
d) BC =2BD =2*6 =12 cm
AD =BC/ =12/2 =6 cm ( triungh. ABC = drept. isoscel)
A =baza* inalt./2 =12*6/2 =36 cm^2
