The apex of the triangle is in fact at 2.65 units above the base.
(2.65 x 4) / 2 = 5.3 sq units which is just under 1/3 of 16.
I did this by drawing and measuring. I think it ought to be dead on 1/3.

So I claim my £5!🤣🤣🤣🤣
Fair enough, here's your 5 pounds ----

5 lbs.jpeg
 

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