Three pairs of angles formed when parallel lines are cut by a transversal.

1. ________1. These linesdo not intersecteachother and they lieon the same
plane or coplanar lines.
________2. These lineslie on different planesor non-coplanar lines.
________3. It’s a linethatintersects/cuts two or more coplanar lines attwo or
more different points.
lraplalesinel
weks nisel
vansreltraslein

2. Pairsof Anglesformed by Parallellines cutby a
transversal
Elton John B. Embodo

3. Statement of the Aim
• Identify the followingpairsof angles whether alternate
interior angles, alternateexterior angles or
correspondingangles;
• Name a pair of alternateinteriorangles, alternate
exterior angles and correspondinganglesbased on the
given figure;
• Measure the pairsof alternateinteriorangles, alternate
exterior angles and correspondingangles

4. Do the followinginyour group
1. Draw a horizontalline and labelas line l.
2. Draw another horizontal linebelow the linel and labelit
as line k.
3. Make sure that line l and line k are parallellines.
4. Draw a diagonalline or a transversalline, intersecting the
two parallel lines,then labelthe transversalline as line t.
5. Name the points of intersectionsas pointX and Y.

5. The desired figure inyour activity;
. t
l
k
1 2
3 4
5 6
7 8
X
Y

6. t
l
k
1 2
3 4
5 6
7 8
X
Y

7. Pairsof Angles formed by Parallellines Cut by aTransversal
Alternate interiorangles–are two non-adjacentinterior angleson the
opposite sides of the transversal.
Ex: and
and
Alternate exterior angles–are two non-adjacentexterior angles on the
opposite sides of the transversal.
Ex: and
and
Corresponding angles–are two non-adjacentangles, one interior and
one exterioron thesame side of the transversal
Ex: and , and , and , and3
6
4
5
1
82
7
1
3
7
5
2 6 4 8

8. Directions: Name all pairs of alternateinteriorangles, alternate
exteriors angles and corresponding angles based on thefigure
below.
1t
2t
u v
A B
C D E F
G H
I J
K L
M N
O P

9. Assignment
Draw a parallel lines cut by a transversal and use a protractor to
measure thefollowing:
• Alternate interior angles
• Alternate exterior angles
• Corresponding angles.