Lesson 4:
Triangles
Objectives:
1. The student will define the following terms:
triangle
right
triangle
acute
triangle
obtuse
triangle
equilateral
triangle
isosceles triangle
scalene
triangle
2. The student will classify angles based on their angle measures and side lengths.
3. The student will make the following conclusions:
The sum of the measures of the interior angles of a triangle is 180 degrees.
For any
triangle, the longest side is opposite the largest angle, and the shortest side
is opposite the smallest angle.
Base angles
of an isosceles triangle are congruent.
Interior
angles of an equilateral triangle are congruent and are 60 degrees.
Paper Activity: Angles of a Triangle
Activity: Sides of a Triangle
GSP Activity: Sides of Triangles