We need to find the length of the longest side of an arrowhead.
Length of the longest side of the tip is
.
The length of one of the legs of the isosceles right triangle is 10 units.
Since, it is a isosceles right triangle, two sides will have equal lengths.
So, the other side of the triangle will also be 10 units and the angle between these two sides will be
.
So, the Pythagoras theorem can be used to find the third side which will be the longest.

The length of the longest side of the tip is
.
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