A paper has the precise shape of a triangle which is denoted by ABC, with AB = BC = CA = x (say) and, D is a point on BC.
Vertex A is joined onto D forming the crease EF  where E is on AB and F is on AC.
Given that DF is perpendicular to BC, determine:
 The length of EF in terms of x.
 The area of each of the triangles BED, DEF and DFC in terms of x.
(In reply to
Solution by Salil)
The square root symbol and 1/2 symbol has come out ji and o respectively. But in word file symbol where correct.

Posted by Salil
on 20130422 02:33:05 