Assertion: triangle's base | /r/HasProperty | other pythagorean leg
Facets:
Source sentences:
text: They are formed by joining two congruent Pythagorean triangles along either of their common legs such that the equal sides of the isosceles triangle are the hypotenuses of the Pythagorean triangles, and the base of the isosceles triangle is twice the other Pythagorean leg.