Question

Find the length of DE

Answer 1

Considering line AB is 9.4 in you can infer that line AE is 4.7 in because 9.4/2=4.7

Then using A^2+B^2=C^2

We can say 4.7^2+B^2=13^2

22.09 +B^2 = 169

169-22.09= 146.91

B^2=146.91

Square rooting both sides gives you
B=12.12