IX A Math Ch-6 Lines and Angles
16/06/21 ( Wednesday)
Diagnostic Test
Topics taught:
1. Discussion of DT answers
2. Types of lines
3. Types of angles
4. Types of angles formed by two parallel lines and transversal.
5. Axiom: If a ray stands on a line, then the sum of the two adjacent angles so formed is 180° and vice versa.
This property is called as the Linear pair axiom.
17/06/21 ( Thursday)
Theorem 6.1 : If two lines intersect each other, then the vertically opposite angles are equal.
Exercise 6.1
Q1.
Q3.
Q2. (hints are given write in proper format)
Q4. (hints are given write in proper format)
18/06/21 ( Friday)
Axiom 6.3 : If a transversal intersects two parallel lines, then each pair of corresponding angles is equal.
Axiom 6.4 : If a transversal intersects two lines such that a pair of corresponding angles is equal, then the two lines are parallel to each other.
Theorem 6.2 : If a transversal intersects two parallel lines, then each pair of alternate interior angles is equal.
Theorem 6.3 : If a transversal intersects two lines such that a pair of alternate interior angles is equal, then the two lines are parallel.
Theorem 6.4 : If a transversal intersects two parallel lines, then each pair of interior angles on the same side of the transversal is supplementary.
Theorem 6.5 : If a transversal intersects two lines such that a pair of interior angles on the same side of the transversal is supplementary, then the two lines are parallel.
Theorem 6.6 : Lines which are parallel to the same line are parallel to each other.
22/06/21 ( Tuesday)
Topic Taught: Exercise 6.2
23/06/21 ( Wednesday)
Topic Taught: Exercise 6.3
