21 P4.GE.JM.17092638
Level 2
The figure is made up of equilateral triangles. What is the least number of triangles should be shaded to form a symmetry with the dotted line?
2 m
Symmetry Equilateral triangle Min-max
22 P4.AN.JM.17092851
Level 3
The figure shows a square ABCD. ∠BAE = 27°.
  1. Name the line of symmetry for the square ABCD.
  2. Find ∠AEC.
4 m
Square Angles sum of triangle Symmetry
23 P4.AN.JM.17092852
Level 3
The figure shows a square PQRS. ∠QST is 21° larger than ∠RST.
  1. Name the line of symmetry for the square PQRS.
  2. Find ∠QST.
  3. Find ∠QTS.
4 m
Square Angles sum of triangle Symmetry Model Comparison Units method
24 P4.AN.JM.17092853
Level 3
The figure shows a square JKLM. ∠LJN is twice as large as angle MJN.
  1. Name the line of symmetry tor the square JKLM.
  2. Find ∠LJN.
  3. Find ∠JNM.
4 m
Square Angles sum of triangle Symmetry Model Times-as-many Units method

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