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Geometry 5
Level 1
Interior angles in a triangle
Interior angles in a quadrilateral
Interior angles in a pentagon
Interior angles in a pentagon
Interior angles in a hexagon
General rule
Sum of interior angles = (number of sides - 2) x 180
Exterior angles = 360 degrees
Equilateral triangle
Equilateral triangle. All angles are the same.
Exterior angles = 360 degrees
120
120
120
60
60
60
Angles on a line sum to 180
120
120
120
60
60
60
A square is a regular quadrilateral
90
90
90
90
Interior angles are all 90
90
90
90
90
Exterior angles are all 90 and add up to 360
90
90
90
90
Regular pentagon
Exterior angles add up to 360
Exterior angles add up to 360
Exterior angles add up to 360
Interior angles are on a line with exterior angles
Interior angles are on a line with exterior angles
Find the interior and exterior angles of a regular hexagon.
Exterior angles.
Interior angles.
How many sides does a regular polygon have if the
exterior angles are 45 degrees?
How many sides does a regular polygon have if the
exterior angles are 45 degrees?
How many sides does a regular polygon have if the
interior angles are 144 degrees?
How many sides does a regular polygon have if the
interior angles are 144 degrees?
Exterior angle
Number of sides
Find all the angles
