Right Angle - Angle Exact 90o ., Acute Angle - Angle less than 90o ., Obtuse Angle - Angle more than 90o but more than 180o . ., Straight Angle - Angle Exact 180o ., Reflex Angle - Angle more than 180o but less than 360o ., Complete Angle - Angle Exact 360o .,

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