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Points in a square, surface

ghostfirefox

New member
Nov 13, 2019
14
Let E, F be such points inside the ABCD square that | ∢AEF | = | ∢EFC | = 90∘ and | AE | = 2, | CF | = 6 and | EF | = 6. Calculate the surface of ABCD.
 

skeeter

Well-known member
MHB Math Helper
Mar 1, 2012
644
$|AC| = 10$ ... see what you can do with that piece of information