Similar TrianglesHigh School · Geometry · HSG-SRT.A.2, HSG-SRT.B.4, HSG-SRT.B.5
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High School · Geometry · Think & learn · Ages 14–18

Similar Triangles

Maths standardHSG-SRT.A.2HSG-SRT.B.4HSG-SRT.B.5Use similarity and scale factors to find unknown lengths, including a line parallel to one side of a triangle.

  1. Match corresponding sides (same position, same angles).
  2. Scale factor = big side ÷ matching small side.
  3. Multiply (or divide) to find x.
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