Angles
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Common Angles
Acute
Obtuse
Right
Reflex
Revolution
Others
Naming Angles
Complementary and Supplementary
Angles At A Point
Alternate
Using a Protractor
Corresponding
Co-interior
Vertically Opposite Angles
Bibliography
OBTUSE ANGLES
An obtuse angle is more than 90° but less than 180°.
All of the red lines are obtuse angles.