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Unformatted text preview: But (a) say that the set of equilateral triangles is a subset of the set of isosceles triangles. (b) If two triangles are not similar, then they are not equilateral. Of course one of them can be equilateral, so you have to form your statement so that this is clearly and correctly stated. The authors may have meant this, but did not say it. (d) If two angles in a triangle are not complementary, then the triangle is not a right triangle. The problem here is that literally as stated, one can take two angles and test....
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 Winter '11
 JamesKing
 Math

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