SOLUTION: What is the formula for the area of an arrowhead?

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Question 1146855: What is the formula for the area of an arrowhead?
Answer by ikleyn(53765) About Me  (Show Source):
You can put this solution on YOUR website!
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https://rechneronline.de/pi/arrowhead-quadrilateral.php

https://nrich.maths.org/587/solution