looking for some advice with my GCSE revision in tackling the following please:
Q10 b and Q11:
For Question 10, I so far have that EF = 28.8cm and BC = 48cm, using properties for similar triangles. But how do we use that information to find areas? I can't seem to find anything in my notes which would help me find the area.
And for question 11 I am struggling to see where I should start, a hint or two to help me get the ball rolling would be really appreciated. Thanks!
Hint: $$\frac{A_{ABD}}{A_{EFB}}=(\frac{AB}{EB})^2$$ This flows from the similarity: $AB=kEB$, $h_1=kh_2$ (where $h_1$ and $h_2$ are corresponding heights) so $A_{ABD}=\frac{1}{2}k^2EB\cdot h_2=k^2A_{EFB}$
Solution for #11: