Interior Angles Flashcards

GCSE Mathematics (Edexcel) 1MA1

Interior angle of a polygon

An angle formed inside a polygon at the intersection of two adjacent sides.

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Terms in this set (10)

1

Interior angle of a polygon

An angle formed inside a polygon at the intersection of two adjacent sides.

2

Sum of interior angles formula

(n - 2) × 180°, where n is the number of sides of the polygon.

3

Interior angle of a regular polygon

(n - 2) × 180° ÷ n, where n is the number of sides.

4

Interior angle of a triangle

The sum of the interior angles of a triangle is always 180°.

5

Interior angle of a quadrilateral

The sum of the interior angles of a quadrilateral is always 360°.

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Relationship between interior and exterior angles

Interior angle + Exterior angle = 180° for any polygon.

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Interior angle of a regular hexagon

The interior angle of a regular hexagon is 120°.

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Interior angle of a regular pentagon

The interior angle of a regular pentagon is 108°.

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Finding the number of sides from an interior angle

Use the formula: n = 360 ÷ (180° - interior angle).

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Angles in a regular polygon

All interior angles are equal in a regular polygon.

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