Question

Câu 1:

Answer 1

AC=căn 5^2+12^2=13cm

=>C ABC=C DEF=5+12+13=18+12=30cm

=>DE=EF=DF=10cm

Answer 2

AC=căn 5^2+12^2=13cm

=>C ABC=C DEF=5+12+13=18+12=30cm

=>DE=EF=DF=10cm