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| Frage | Antworten |
| How is an angle formed? |
Image:
angle.gif (image/gif)
|
| What does the measure of an angle depend on? | The size of the opening between the sides. |
| What is the unit of measure for angle openings? | Degree |
| Complementary | Two angles are complementary, if the add up to 90, which means they form a right angle. |
| Supplementary | Two angles are supplementary if their measures add up to 180, which means they form a straight angle |
| What happens when two lines intersect or cross? | They form two pairs of equal angles. |
| Vertical Angles | The equal angles are opposite (or across) from each other |
| What are vertical angles? | Equal |
| Perpendicular Lines | Lines that intersect at a right angle. They create a square corner. |
| Parallel Lines | Lines that run side by side and do not cross at any point if extended. |
| Transversal | A third line that crosses two parallel lines. When a transversal crosses two parallel lines, a set of four angles is formed at each point of intersection. |
| Right Angle | 90 |
| Acute Angle | Less than 90 |
| Obtuse Angle | More than 90 and less than 180 |
| Straight Angle | 180 |
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