What is point?
Ans:- A geometrical figure which have no length , no breadth and no thickness. It is used in indicating objects. The name of point is written by capital alphabets.
Ans:- A geometrical figure which have no length , no breadth and no thickness. It is used in indicating objects. The name of point is written by capital alphabets.
What is straight line?
Ans:- A straight line is a geometrical figure which have length but no breadth and thickness. It has two extending points. It extends in both direction so it has no fixed length. It can not be measured.
Ans:- A straight line is a geometrical figure which have length but no breadth and thickness. It has two extending points. It extends in both direction so it has no fixed length. It can not be measured.
Example 1:- Draw a straight line of 'PQ'
Q:- solve these questions
1- Draw a straight line 'AB'
2- Draw a straight line 'CD'
3- Draw a straight line 'EF'
4- Draw a straight line 'XY'
5- Draw a straight line 'KL'
6- Draw a straight line 'OP'
7- Draw a straight line 'GH'
8- Draw a straight line 'MN'
9- Draw a straight line 'ST'
10- Draw a straight line 'QR'
What is Ray?
Ans:- A Ray is a geometrical figure which have length but no breadth and thickness. It has one extending point and one end point. It extends in one direction so it has no fixed length. It can not be measured.
Example 2:- Draw a ray of PQ
Q:- solve these questions
1- Draw a ray 'AB'
2- Draw a ray 'CD'
3- Draw a ray 'EF'
4- Draw a ray 'XY'
5- Draw a ray 'KL'
6- Draw a ray 'OP'
7- Draw a ray 'GH'
8- Draw a ray 'MN'
9- Draw a ray 'ST'
10- Draw a ray 'QR'
What is line segment?
Ans:- A line segment is a geometrical figure which have length but no breadth and thickness. It has two end points. It does not extend in any direction so it has fixed length. It can be measured.
Example 3:- Draw a line segment of 'PQ'
Q:- solve these questions
1- Draw a line segment 'AB' of length 6 cm.
2- Draw a line segment 'CD' of length 6.8 cm
3- Draw a line segment 'EF' of length 8.8 cm
4- Draw a line segment 'XY' of length 5.5 cm
5- Draw a line segment 'KL' of length 9 cm
What is plane?
Ans- A plane is a flat surface with no thickness. It extends endlessly in all direction. A plane has only two dimension-length and breadthEx- surface of notebook, surface of table etcWhat is incidence properties in a plane? Ans-The relationship between points and lines are called incidence properties in a planeEx-1-Any number of lines can be drawn through a given point2- Only one line can pass through two given points in a planeWhat are intersecting lines? Ans:- Two lines which have a point in common are called intersecting lines. What is point of intersection? The point that is common to both the intersecting lines is called point of intersection.What are parallel lines? Lines that lie in the same plane such that the perpendicular distance between them is same from any point are called parallel lines. What are collinear points? Ans-Three or more than three points that lie on a straight line are called collinear points.What is line of collinearity? Ans-A line passing through some collinear points is called the line of collinearity. What are concurrent lines? Ans- Three or more than three lines which pass through the same Point are called concurrent lines. What is point of concurrence?Ans- The point through which three or more than three lines pass is called point of concurrence.
What is angle?
Ans:- An angle is formed when two rays have a common end point.
Solve these problems
1- Draw an angle of 30 degree using protector.
2- Draw an angle of 45 degree using protector.
3- Draw an angle of 60 degree using protector.
4- Draw an angle of 90 degree using protector.
5- Draw an angle of 120 degree using protector.
6- Draw an angle of 150 degree using protector.
7- Draw an angle of 100 degree using protector.
8- Draw an angle of 70 degree using protector.
9- Draw an angle of 130 degree using protector.
10- Draw an angle of 105 degree using protector.
What is Acute angle?
Ans:- An angle whose measures is more than 0° but less than 90° is called acute angle.
Ex- 30° , 45° , 60°
Circle the acute angles.
a- 20° 46° 100° 89° 105°
b- 75° 15° 150° 55° 12°
c- 99° 2° 80° 133° 90°
d- 28° 59° 110° 50° 88°
e- 60° 165° 72° 39° 139°
What is right angle?
Ans:- An angle whose measures is 90° is called right angle.
Ex:- 90°
What is obtuse angle?
Ans:- An angle whose measures is more than 90° but less than 180° is called obtuse angle.
Ex:- 110° , 95° , 160°
Circle the obtuse angles.
a- 20° 46° 100° 89° 105°
b- 75° 15° 150° 55° 12°
c- 99° 2° 80° 133° 90°
d- 28° 59° 110° 50° 88°
e- 60° 165° 72° 39° 139°
What is straight angle?
Ans:- An angle whose measures is 180° is called straight angle.
Ex:- 180°
What is reflex angle?
Ans :- An angle whose measures is more than 180° but less than 360° is called reflex angle.
Ex:- 260° 195° 272° 339° 355°
Circle the reflex angles.
a- 20° 246° 190° 389° 205°
b- 175° 315° 150° 255° 12°
c- 199° 22° 180° 233° 290°
d- 28° 159° 210° 250° 188°
e- 360° 165° 172° 239° 39°
What is complete angle?
Ans:- An angle whose measures is 360° is called complete angle.
Ex:- 360°
Identify these angles
20°
346°
100°
89°
105°
60°
165°
72°
39°
139°
360°
165°
172°
239°
90°
22°
180°
233°
290°
What is complementary angle?
Two angles whose sum is 90° is called complementary angle.
Ex:- 60° and 30° , 25° and 65°
Solve these questions
1- Find the complementary angle of 55°
2- Find the complementary angle of 48°
3- Find the complementary angle of 26°
4- Find the complementary angle of 85°
5- Find the complementary angle of 72°
What is Supplementary angle?
Two angles whose sum is 180° is called supplementary angle.
Ex:- 100° and 80° , 125° and 55°
Solve these questions
1- Find the supplementary angle of 128°
2- Find the supplementary angle of 110°
3- Find the supplementary angle of 66°
4- Find the supplementary angle of 80°
5- Find the supplementary angle of 172°
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