Respuesta :
the length would be 15 because they are congruent triangles.
Answer with explanation:
It is given that, ΔABC ≅ ΔDEF.
AB=12 cm
BC=15 cm
AC=17 cm
Also, you will observe that,
AB² + BC²
= 12² + 15²
=144 +225
=289
=AC²
Hence, ΔABC is right angled triangle,right angled at B.
Also, it is given that, ΔABC ≅ ΔDEF
So, DE=AB=12 units
BC=E F=15 units
D F=AC=17 units
So,E F=15 units
