Lesson 4: Triangles
I Can...
...state the different properties of a triangle, including the sum of the interior angles of a triangle.
...use my knowledge of angles to find the measure of the missing angle of a triangle.
...use my knowledge of angles to find the measure of the missing angle of a triangle.
Words to Know
Acute Triangle: a triangle containing all acute angles
Right Triangle: a triangle containing one right angle
Obtuse Triangle: a triangle containing one obtuse angle
Line Segment: the side of a triangle which is a straight path between two points
Congruent Segments: line segments that have the same length
Scalene Triangle: a triangle containing no congruent sides
Isosceles Triangle: a triangle containing at least two congruent sides
Equilateral Triangle: a triangle with all three congruent sides
Right Triangle: a triangle containing one right angle
Obtuse Triangle: a triangle containing one obtuse angle
Line Segment: the side of a triangle which is a straight path between two points
Congruent Segments: line segments that have the same length
Scalene Triangle: a triangle containing no congruent sides
Isosceles Triangle: a triangle containing at least two congruent sides
Equilateral Triangle: a triangle with all three congruent sides
Examples
1. Classifying Triangles
Video
Video
Tips
Extra Examples
Click here for additional examples and self check quizzes.
Problems of the DAY
Answers must be submitted by 9am the following school day!
1. Would the roof of your house be considered scalene, isosceles, or equilateral?
2. Why do all triangles have at least two acute angles?
1. Would the roof of your house be considered scalene, isosceles, or equilateral?
2. Why do all triangles have at least two acute angles?