help

[elder holly]

GE is = to CD-FG=8 the trinagles are congurent thus have the same ratio on lenth in each size so AE=10 and AG=6 thus CBF=9=DE

I think that is right but it may be Pythagoras

Wait is GE marked at 7 because if so the shape cannot work as FE=13 while CD=12 and CD=FE

[eager sky]

.

i made a mistake in the original photo

fixed it

[eager sky]

why

[pseudo plinth]

For this question, if we use silmilarities, 3:5=3+X:12. So, 15+5x = 36, x= 4.2. so, length BF should equal to 7.2

[elder holly]

The angles of both triangles are =

It would be (7/5x3)+3=DE

Which is = to 7.2

[eager sky]

.close