Demonstrate that the angle sum of a triangle is 180° and use this to find the angle sum of a quadrilateral (ACMMG166)

LO: To demonstrate that the angle sum of a triangle is 180 degrees.
Know:

  • That different types of triangles exist.
  • What sides and angles are.

Understand:

  • That triangles have a angle sum of 180 degrees.

Do:

  • I can find the missing angle of a triangle.
  • I can find the angle sum of a quadrilateral.

The internal angles of all triangles always adds up to 180 degrees.


It doesn’t matter how large or small the triangle, it always adds up to 180 degrees.

Teaching Ideas

Angle Sum Videos

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