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