Question

plz answer to this fast....

Answer 1

its a bit confusing


but i hope you get it

Answer 2

{(a+d)+(b+c)} {(a+d)-(b+c)}

(a+d)^2 -(b+c)^2 =(a-d)^2 -(b-c)^2

(a+d)^2 -(a-d)^2 =( b+c)^2 -(b-c)^2

4ad=4bc

a/b=c/d

a:b = c:d proved