Activity: Geometric Dartboards
Objective: Students will create their own geometric dartboard and calculate
geometric probabilities.
Materials:
 Posterboard
 Felt (Various colors)
 Scissors
 School Glue
 Rulers
Task:
Follow the steps below to construct your own felt dartboard.
1. Decide what geometric shape you want your dartboard to be. (Ex: square,
rectangle, hexagon, etc.)
2. Cut the base of your dartboard from a sheet of poster board. The dartboard
must not have any dimension larger than 12 inches.
3. Draw a design on one side of the poster board. The design must be
composed of only geometric shapes.
4. Choose from the different shades of felt provided by your teacher and cover
your geometric designed dartboard. You must use at least 4 different colors.
Use school glue to adhere the felt to the poster board. (Do not glue felt on top
of felt, as the felt will not stick to each other.)
Geometry – Probability
~1~
NJCTL.org
Assignment:
Determine the total area of the dartboard, area of each color on the dartboard,
and the geometric probability of each color on your dartboard. Use the chart below for
you data collection. Make sure that you show all of your work. If there is not enough
room to show your work in the table, attach an extra sheet of paper with your work,
properly labeled, for each shape & its color.
Shape of the dartboard: ___________________
Area formula for the dartboard: ____________________
Geometric Probability Activity
Color & its
shape
Area
Formula for
the color
Geometry – Probability
Area of the
Color
~2~
Total area of
the dartboard
Geometric
probability
NJCTL.org
Rubric for Dartboard Lab
Category
Total area
of the
dartboard
Color #1:
________
Color #2:
________
Color #3:
________
Color #4:
________
3 points
2 points
1 point
0 points
(1) Shape of the dartboard is correct.
(2) Area formula for the dartboard is correct.
(3) Total Area (column #4) is calculated
correctly and completed.
5 points
Items (1) – (3)
are correct, but
the Total Area is
not shown in all
of column #4
4 points
Items (1) – (3)
are completed
with one
calculation being
incorrect.
Items (1) – (3)
are completed
with one
calculation being
incorrect and the
Total Area is now
shown in all of
column #4
Items (1) – (3)
are completed
with two of the
calculations being
incorrect.
(1) Color & shape are identified correctly
(2) Area formula matches the shape identified
(3) Work is shown to calculate the area of the
shape.
(4) Area of this color is calculated correctly.
(5) Geometric Probability is calculated
correctly.
(1) Color & shape are identified correctly
(2) Area formula matches the shape identified
(3) Work is shown to calculate the area of the
shape.
(4) Area of this color is calculated correctly.
(5) Geometric Probability is calculated
correctly.
(1) Color & shape are identified correctly
(2) Area formula matches the shape identified
(3) Work is shown to calculate the area of the
shape.
(4) Area of this color is calculated correctly.
(5) Geometric Probability is calculated
correctly.
(1) Color & shape are identified correctly
(2) Area formula matches the shape identified
(3) Work is shown to calculate the area of the
shape.
(4) Area of this color is calculated correctly.
(5) Geometric Probability is calculated
correctly.
Items (1) – (5)
are completed
with one of them
being incorrect
and/or blank.
Items (1) – (5)
are completed
with two of them
being incorrect
and/or blank.
Items (1) – (5)
are completed
with three of them
being incorrect
and/or blank.
Items (1) – (5)
are completed
with four of them
being incorrect
and/or blank.
Items (1) – (5)
are completed
with one of them
being incorrect
and/or blank.
Items (1) – (5)
are completed
with two of them
being incorrect
and/or blank.
Items (1) – (5)
are completed
with three of them
being incorrect
and/or blank.
Items (1) – (5)
are completed
with four of them
being incorrect
and/or blank.
Items (1) – (5)
are completed
with one of them
being incorrect
and/or blank.
Items (1) – (5)
are completed
with two of them
being incorrect
and/or blank.
Items (1) – (5)
are completed
with three of them
being incorrect
and/or blank.
Items (1) – (5)
are completed
with four of them
being incorrect
and/or blank.
Items (1) – (5)
are completed
with one of them
being incorrect
and/or blank.
Items (1) – (5)
are completed
with two of them
being incorrect
and/or blank.
Items (1) – (5)
are completed
with three of them
being incorrect
and/or blank.
Items (1) – (5)
are completed
with four of them
being incorrect
and/or blank.
Items (1) – (3)
are completed
with all of the
calculations being
incorrect.
OR
Total area of the
dartboard is not
completed.
Items (1) – (5)
are completed
with all of them
being incorrect.
OR
Color #1 is not
completed at all.
Items (1) – (5)
are completed
with all of them
being incorrect.
OR
Color #2 is not
completed at all.
Items (1) – (5)
are completed
with all of them
being incorrect.
OR
Color #3 is not
completed at all.
Items (1) – (5)
are completed
with all of them
being incorrect.
OR
Color #4 is not
completed at all.
Total Score
Geometry – Probability
~3~
NJCTL.org
Total