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Angles, Similarity, and Scale

9th Grade · Math · Australian Curriculum

5 lessons

Goal

Apply angle properties of parallel lines and polygons, and use similarity and scale to find unknown angles and side lengths in geometric problems.

5 lessons
0 of 5 done
  1. Angle Properties of Parallel Lines and TransversalsUp next
  2. Interior and Exterior Angles of PolygonsNot started yet
  3. Identifying and Using Similar TrianglesNot started yet
  4. Using Similarity in Right Triangles: Geometric MeanYou are here
  5. Using Scale in Geometric ProblemsNot started yet
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Learning standards covered

auAC9M9M03Australian Curriculum (v9) · Math · 9th Grade

solve spatial problems, applying angle properties, scale, similarity, Pythagoras’ theorem and trigonometry in right-angled triangles

Open Global Standard:OGM.10.GEO.7OGM.10.TRG.1
auAC9M9SP01Australian Curriculum (v9) · Math · 9th Grade

recognise the constancy of the sine, cosine and tangent ratios for a given angle in right-angled triangles using properties of similarity

Open Global Standard:OGM.10.TRG.1
GlobalOGM.10.GEO.7
GlobalOGM.10.TRG.1