Triangle Classification and Angle Properties

Mrs. Lamorn guides students through Unit Seven, Lesson Eight, focusing on sorting triangles by angles and side lengths. The lesson begins with a warm-up activity to estimate angle measures, followed by a detailed explanation of right, obtuse, and acute angles. Students engage in a card sorting activity to classify triangles based on their properties. The lesson concludes with a discussion on different ways to sort triangles and a comparison with quadrilaterals.

What is the main goal of Unit Seven, Lesson Eight?

• To measure angles using a protractor

• To sort and classify triangles

• To learn about different types of quadrilaterals

• To calculate the area of triangles

What is a right angle?

• An angle exactly 90 degrees

• An angle that forms a straight line

• An angle less than 90 degrees

• An angle more than 90 degrees

How can you determine if an angle is obtuse?

• It is exactly 90 degrees

• It forms a straight line

• It is more than 90 degrees but less than 180 degrees

• It is less than 90 degrees

What is the first step in sorting triangles in the activity?

• Calculate the perimeter of each triangle

• Count the number of sides in each triangle

• Identify the type of angles in each triangle

• Measure the area of each triangle

In the activity, what do you do after identifying the angles?

• Draw the triangles on a grid

• Measure the side lengths

• Color the triangles

• Calculate the area

What is a characteristic of a triangle with all sides different?

• It is an equilateral triangle

• It is an isosceles triangle

• It is a scalene triangle

• It is a right triangle

How can you confirm a triangle has a right angle?

• By using a ruler

• By using a protractor

• By using a compass

• By using a calculator

What is the difference between classifying triangles and quadrilaterals?

• Quadrilaterals can have up to four right angles

• Triangles can have only one right angle

• Quadrilaterals have fewer angles

• Triangles have more sides to consider

What is a common feature of all triangles?

• They all have a right angle

• They all have three sides

• They all have equal sides

• They all have obtuse angles