+0  
 
0
69
1
avatar+60 

I'm trying to get full marks but I'm only getting 2/4. My working is in blue. 

 Oct 4, 2020
 #1
avatar
0

BC = x      and FC = x

find BF

x^2 + x^2 = bf^2

2 x^2 =  bf^2

 

then    bf^2 + x^2 = 20 ^2

           2x^2 + x^2 = 400

            3x^2 = 400

             x = 11.547

 Oct 4, 2020

33 Online Users

avatar
avatar