Triangle Transversals
Supplies Needed: One 3 x 5 index card. One 8 ½ X 11 sheet of computer paper. Half
sheet of poster board 22 x 14 (any color). Six colored markers RED, BLUE, GREEN,
ORANGE, PURPLE AND YELLOW. Protractor. Scissors. Glue.
Steps:
1. Using the index card, create an Acute Scalene Triangle.
2. Label the angles 1, 2 and 3. Measure each angle with the protractor to the
nearest degree. *Make note, all three angles must add up to 180°. Write the
measures in the angles on the triangle.
3. On the bottom left corner of the computer paper, trace the triangle and
translate it across the entire page tracing it each time you translate. Copy the
angle names (1, 2, or 3) each time you copy the triangle.
4. Once you have gone across the entire page, rotate the triangle and trace it
back into the “empty” space. Continue copying the angle names (1, 2, or 3) each
time you copy the triangle. You should notice that Parallel Lines are forming.
5. Repeat steps 4 and 5 until you have filled the entire paper. *Note: you must
place the triangle so that the vertices match with the row below. You should
have the same size triangle covering the page, each with angles labeled 1, 2 or
3.
6. You will notice the page now has many parallel lines with several transversals.
Use you knowledge of angle pairs to identify ONE pair of each of the
following:
Corresponding Angles =
RED
Alternate Interior Angles =
BLUE
Alternate Exterior Angles
= GREEN
Same Side Interior =
ORANGE
Vertical Angles = PURPLE
Linear Pair = YELLOW
7. Assemble your poster board (1/2 sheet) including the following:
 Your drawing including colored angle pairs
 Your triangle showing angle measurements adding up to 180°
 Legend explaining different angles pairs and their corresponding COLOR
 Name, Period and Teacher’s name in the LEFT TOP CORNER.
Grading Rubric
Student Name ____________________ Teacher Name ___________ Per ____
Description
Poster has Student
Name, Teacher
Name and Period.
Poster includes
Drawing, Triangle,
and Legend. Poster
is neat.
Triangles were
translated correctly
creating parallel
lines and
transversals.
Angles are clearly
marked with 1, 2 or
3 and labeled
correctly.
Angle Pairs are
correctly indicated
using correct color:
Corresponding
Angle Pairs are
correctly indicated
using correct color:
Alternate Interior
Angle Pairs are
correctly indicated
using correct color:
Alternate Exterior
Angle Pairs are
correctly indicated
using correct color:
Same Side Interior
Angle Pairs are
correctly indicated
using correct color:
Linear Pair
Angle Pairs are
correctly indicated
using correct color:
Vertical Angles
Excellent = 10
Includes all 3
Good = 8
Missing 1
Poor = 5
Missing more than
1
Missing = 0
No information
included
Includes all
required
components and
is neat
Correctly
constructed
drawing
Either missing one
item, or is slightly
messy
Missing more than
one item, is
somewhat messy
Missing triangle
and legend and is
very messy
Slight errors but
overall parallel lines
and transversals
are evident
Lines are not
straight, triangles
were incorrectly
translated
All triangles
correctly
labeled
Only 1 or 2
triangles missing
labels or incorrectly
labeled
Several triangles
missing labels or
incorrectly
labeled
Indicated, but
incorrect
Constructed
incorrectly with
no parallel lines or
transversals
evident
No triangles
labeled
Yes
No indication
Yes
Indicated, but
incorrect
No indication
Yes
Indicated, but
incorrect
No indication
Yes
Indicated, but
incorrect
No indication
Yes
Indicated, but
incorrect
No indication
Yes
Indicated, but
incorrect
No indication