Question

помогите!!!!!!!!!!!!!!!!!!!!!!!!!

Answer 1

ΔBCA ~ ΔECA по двум сторонам и углу между ними⇒

$\dfrac{CD}{AC} =\dfrac{ED}{BA} \\\\\dfrac{100}{400} =\dfrac{50}{BA} \\\\BA=\dfrac{50\times400}{100} =200$