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- Ninth grade math problems; The nature and judgment of similar triangles;
Ninth grade math problems; The nature and judgment of similar triangles;
Because of similarity, the area ratio is the square of the side length ratio.
So △ABC/△A' B'C'=(AB/A'B') =4/9.
So: S△ABC=4/9S△A'B'C'
So: 13/9S△A'B'C'=78.
S△A'B'C'=54
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