Download Sec 4.1 Lesson Opener Triangles

MCRBG-0401-LS.qxd
4-19-2001
12:01 PM
Page 13
LESSON
4.1
NAME
DATE
Available as
a transparency
Activity Lesson Opener
For use with pages 194–201
SET UP: Work with a partner.
You will need: • ruler • protractor
1. Look at the descriptions below. One person should use a
Lesson 4.1
ruler to draw the triangles described by their Sides. The
other person should use a protractor to draw the triangles
described by their Angles. Then check each other’s
triangles and switch roles.
Sides
• A triangle with no congruent sides
• A triangle with 2 congruent sides
• A triangle with 3 congruent sides
Angles
• A triangle with 1 right angle
• A triangle with 1 obtuse angle
• A triangle with 3 acute angles
2. With your partner, fill in the table below with sketches of
triangles described by the column and row headings. For
example, the arrows show that in the first box you will
draw a triangle that has no congruent sides and 1 right
angle. If a triangle with the sides and angles described is
impossible, write “impossible” in the box.
1 right angle 1 obtuse angle 3 acute angles
No congruent sides
2 congruent sides
3 congruent sides
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Geometry
Chapter 4 Resource Book
13