Download Triangles Lesson Plan

Triangles
Lesson Plan
Background Information
Objectives
At the end of the triangles
lesson, students will be able to:
• Apply the properties and
characteristics of all triangles to
solve real-world problems.
• Identify and use the unique
characteristics of right,
isosceles, equilateral, acute,
obtuse and scalene triangles.
All triangles have three sides and three angles. Triangles are classified as right,
equilateral, isosceles, or scalene by the measures of their sides and angles.
Two triangles are similar when their corresponding sides are in proportion to each
other. Similar triangles always have equal corresponding angles. Similar triangles
have the same shape, but they are not necessarily the same size.
This lesson should take approximately 1 hour and 15 minutes to complete, if all
components are utilized.
Video
In the video, we will see how triangles are named, how they are compared, and how
they are used to solve problems in the real world. Show the video Real World Problems.
After the video, focus on these points:
• The sum of the angles in any triangle is always 180°.
• Equilateral triangles have three equal sides and angles.
• Isosceles triangles have two equal sides and angles.
• Scalene triangles have no equal sides or angles.
• Triangles are similar if they have equal corresponding angles.
• The long side opposite the right angle of a right triangle is called the hypotenuse.
• The formula for the area of a triangle is ½ x base x height.
Worksheets/Practice
These worksheet problems provide practice and reinforce concepts presented in the
video.
GED Connection Mathematics, Geometry, p. 179, Skill Practice
GED Practice, p. 186, problems 2 and 3
GED Practice, p. 187, problems 9 and 12
GED Practice, p. 188, problems 20 and 22
GED Practice, p. 190, problems 31 and 34
Triangles • 1
Funded by Kentucky Adult Education
Online Activities
Further practice can be found online at LiteracyLink (www.pbs.org/literacy).
Further explanations and a practice test can be found at ThinkQuest.
Test Tip:
•
Not all geometry items on the GED® Math test will have a diagram. Making a quick sketch may help you understand the problem.
GED® and GED Testing Service® are registered trademarks of the American Council on Education. Used under license.
2 • Triangles
Funded by Kentucky Adult Education