Understanding Interior and Exterior Angles

Front

Interior angle (definition)

Back

inside a polygon formed by two adjacent sides

Front

Exterior angle (definition)

Back

formed between one side of a polygon and the extension of its adjacent side

Front

Sum of interior angles (polygon)

Back

Front

Sum of exterior angles (polygon)

Back

Front

Regular polygon (interior angle)

Back

interior angles are equal

Front

Regular polygon (exterior angle)

Back

exterior angles are equal

Front

Formula for each interior angle (regular polygon)

Back

latex="\frac{(n-2) \times 180^\circ}{n}">

Front

Formula for each exterior angle (regular polygon)

Back

latex="\frac{360^\circ}{n}">

Front

Relationship: interior + exterior angle (at a vertex)

Back

latex="180^\circ">

Front

Triangle (sum of interior angles)

Back

latex="180^\circ">