Question

Calculati aria unui dreptunghi ABCD care are AC=12 cm si m(BAD)=30°

Answer 1

[tex]BC= \frac{AC}{2} = \frac{12}{2} =6 \\ cos 30= \frac{AB}{AC} \\ \frac{ \sqrt{3} }{2} = \frac{AB}{12} \\ AB=6 \sqrt{3} \\ A=l*L=AB*BC=6 \sqrt{3} *6= 36 \sqrt{3} cm^{2} [/tex]