What are parallel lines?
(You may need a separate lesson for this)
Students may not understand vertical distance
between parallel line

Questions
1.  How many angles?
2. How many pair?
3. How many equal pairs?
4. How many supplementary pairs?
5.  Ask students to draw lines and measure angles

Show teacher notes

Author- Tharanath
License- CC BY SA 4.0

A = (10.11, 6.74)
B = (17.11, 6.74)
a = Line(A, B)
C = (-1.01, 0.37)
b = Line(C, a)
D = (1.655, 9.62)
c = Line(C, D)
E = Point(b)
α = Angle(E, C, D)
F = Intersect(a, c)
G = Intersect(a, c)
d = OrthogonalLine(C, a)
β = Angle(a, c)
K = (10, 3)
e = Line(K, a)
γ = Angle(e, c)
L = Point(b)
δ = Angle(D, C, L)
M = Intersect(c, e)
N = (-6, 3)
ε = Angle(D, M, N)
O = Point(c)
P = Intersect(a, c)
Q = Point(a)
ζ = Angle(O, P, Q)
f = true
Curve(x) = ?