Problem

How many equilateral triangles of all sizes are there in the 3 by 3 by 3 equilateral trian...

How many equilateral triangles of all sizes are there in the 3 by 3 by 3 equilateral triangle shown next? (An equilateral triangle is a triangle with three sides of the same length. We will discuss equilateral triangles later in the book.)

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Solutions For Problems in Chapter 1.1

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