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Triangles & quadrilaterals

A triangle’s angles add to 180°

Unlocks in Lesson 1: Triangles →

Triangles & quadrilaterals

Isosceles: the base angles are equal

Unlocks in Lesson 1: Triangles →

Triangles & quadrilaterals

Exterior angle = the two far corners

Unlocks in Lesson 1: Triangles →

Triangles & quadrilaterals

A quadrilateral’s angles add to 360°

Unlocks in Lesson 2: Quadrilaterals →

Triangles & quadrilaterals

Parallelogram: opposite angles are equal

Unlocks in Lesson 2: Quadrilaterals →