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'Isosceles Triangles' printed from http://nrich.maths.org/
Isosceles triangles have two equal sides.
The area of a triangle is half the base times the height.
Any of the three vertices of the triangle can be at $(20, 20)$.
There are sets of identical (congruent) triangles with an area of
How many triangles are there in each set? How many sets?