Ответ:

Объяснение:

7. A(ΔABC)=AB*AC/2; ΔBDE ~ΔABC; 5/13=(13+2)/BC; BC=15*13/5=39;

AC=√(39²-15²)=36; A(ΔABC)=15*36/2=270

8. A(AFG)/A(ACD)=12/(12+15)=12/27;  

A(AEF)/A(ABD)=12/27; 27*A(AEF)/=15*A(ABD)=240; A(ABD)=240/15=16