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Acute Angle
Less than 90 degrees
Obtuse angle
Bigger than 90 degrees, less that 180 degrees
Reflex angle
Bigger than 180 degrees
Right angle
exactly 90 degrees
Angles on a line
add up to 180 degrees.
Angles around a point
Add up to 360 degrees.
Angles in a triangle
Add up to 180 degrees.
Isosceles triangle
Two equal angles
Equilateral triangle
three equal angles, each 60 degrees
Angles in a quadrilateral
Add up to 360 degrees
Exterior angles
Add up to 360 degrees
Interior and exterior angle
add up to 180 degrees
Sum of interior angles
(Number of sides - 2) x 180
Vertically opposite angles
Are equal
Alternate angles
Z angle, are the same
Corresponding angles
F angle, are the same
Co - interior angles
C angle, add up to 180 degrees.
How to find the number of sides from the exterior angle
360 divided by one exterior angle