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Types of Angles

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Supplementary angles:Two angles whose measures add to 180 degrees. The following are supplementary angles.

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Supplementary angles:Two angles whose measures add to 180 degrees. The following are supplementary angles.

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Adjacent angles:Angle with a common vertex and one common side. <1 and <2, are adjacent angles.

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Adjacent angles:Angle with a common vertex and one common side. <1 and <2, are adjacent angles.

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Reflex angle:An angle whose measure is bigger than 180 degrees but less than 360 degrees.The following is a reflex angle.

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Reflex angle:An angle whose measure is bigger than 180 degrees but less than 360 degrees.The following is a reflex angle.

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Obtuse angle:An angle whose measure is bigger than 90 degrees but less than 180 degrees. Thus, it is between 90 degrees and 180 degrees. The following is an obtuse angle.

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Obtuse angle:An angle whose measure is bigger than 90 degrees but less than 180 degrees. Thus, it is between 90 degrees and 180 degrees. The following is an obtuse angle.

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Straight angleAn angle whose measure is 180 degrees.Thus, a straight angle look like a straight line. The following is a straight angle.

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Straight angleAn angle whose measure is 180 degrees.Thus, a straight angle look like a straight line. The following is a straight angle.

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Straight Angle

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Right angle:An angle whose measure is 90 degrees. The following is a right angle.

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Right angle:An angle whose measure is 90 degrees. The following is a right angle.

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An angle whose measure is less than 90 degrees. The following is an acute angle.