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| Summary |
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 An acute angle has a measure less than 90o. |
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A Right angle has a measure of 90o. |
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An Obtuse angle has a measure greater than 90o but less than 180o. |
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A Straight angle has a measure of 180o. |
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A reflex angle has a measure greater than 180o. |
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Adjacent angles have a common vertex and a common arm. |
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A pair of angles, the sum of whose measures is 90o, are complementary angles. |
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A pair of angles, the sum of whose measures is 180o are supplementary angles. |
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When a pair of angles are adjacent and also supplementary, they are said to form a linear pair. |
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If a straight line stands on another straight line, the adjacent angles so formed are supplementary. |
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If two adjacent angles are supplementary, their exterior arms lie in a straight line. |
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If two lines intersect, the vertically opposite angles so formed are equal. |
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When a number of lines meet at a point, the sum of the angles so formed is 360o. |
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