Ah, the BPT, beta? If a line is drawn parallel to one side of a triangle, it cuts the other two sides in the same proportion. The equal areas proof? You join one vertex to create two small triangles with equal area... then their bases must be proportional. Honestly, the book proof feels longer than my shift. I told your brother the same thing years ago, watching him bend over his notebook right here at this table. The real trick is to draw the diagram neatly—just like he always did.
#exams#study
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