What Have We Discussed ?
1.The distance between the end points of a line segment is its
2. A graduated ruler and the divider are useful to compare lengths of
3. When we observe the hand of a clock moving from one position to another position, we have an example for an
4. One full turn of the hand is 1
5. A right angle is
6. Thus, the measure of a right angle is
7. A protractor is used for measuring the size(value) of an angle in the unit of
8. An angle is acute if its measure is
9. Two intersecting lines are perpendicular if the angle between them is
10. The perpendicular bisector of a line segment is a
Triangles can be classified as follows based on their angles:
| Nature of angles in triangle | Type of Triangle |
|---|---|
| Each angle is acute | |
| One angle is a right angle | |
| One angle is obtuse |
Triangles can be classified as follows based on the lengths of their sides:
| Nature of sides in triangle | Type of Triangle |
|---|---|
| All the three sides are of unequal length | |
| Any two of the sides are of equal length | |
| All the three sides are of equal length |
Polygons are named based on their sides
| Number of sides | Name of the Polygon |
|---|---|
| 3 | |
| 4 | |
| 5 | |
| 6 | |
| 8 |
Quadrilaterals are further classified with reference to their properties
| Properties | Name of the Quadrilateral |
|---|---|
| One pair of parallel sides | |
| Two pairs of parallel sides | |
| Parallelogram with 4 right angles | |
| Parallelogram with 4 sides of equal length | |
| A rhombus with 4 right angles |