IES Saavedra Fajardo 4º ESO Matemáticas B
Producing a pocket protractor
1.
Take a square of paper
2.
Fold it in two equal rectangles and unfold it
3.
Fold the right up corner so that vertex A goes on segment
CD, caring that the crease goes through vertex...
More
IES Saavedra Fajardo 4º ESO Matemáticas B
Producing a pocket protractor
1.
Take a square of paper
2.
Fold it in two equal rectangles and unfold it
3.
Fold the right up corner so that vertex A goes on segment
CD, caring that the crease goes through vertex B as well.
4.
Fold up the left down corner so that the vertex coincides
with vertex A
5.
Finally, fold up the base of the triangle, as shown in the
picture
6.
You have made a triangle shaped tool that can be used to
measure angles!
Search the model
Unfold the triangle and find the measure of all the angles
between the creases.
Name the angles and tell how you have worked out the
measure of each one.
You can help yourself by folding the
square in order to answer the following questions
Which angles are 90º?
Which angles are equal?
Which angles make 180º when added?
Which ones make 90º?
These answers will allow you to complete the following chart
a 90º i q
b j r
c k s
d l t
e m u
f n v
g o w
h p x
Less
