Pierino and the Riddle of the Papyrus

Geometry Level 1

Pierino, a well-known character of Italian short stories, has never been a math-enthusiast in his educational career... But he has decided to change his attitude, and he wants to impress his Math teacher at school. He wants to do something that has never done before: solve a puzzle that was found on an ancient Egyptian papyrus...

Here is the riddle.

"An L-sided square is inscribed in a circumference:

Given the following geometric construction:

the area of the yellow triangle is... "

Pierino is pretty sure about the answer, but he does not want to miss this opportunity to impress his school teacher, so he is going to give you (the only math freak that he knows) a call in a minute, sort of "Phone-a-friend" lifeline from the Millionaire... Will you be able to help him?

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