G4 L16-2 Classify Triangles

Less 16-2

Classify Triangles

LESSON OBJECTIVES

Classify triangles by line segments and angles.

Review then Solve the book's practices.

Pages 829-830

Multiple Choice

How many equal sides does an equilateral triangle have?

• 2 equal sides

• 3 equal sides

• no equal sides

Multiple Choice

What is an obtuse triangle?

• a triangle that has one obtuse angle.

• a triangle that has three obtuse angles.

• a triangle that only has acute angles.

Multiple Choice

What is a triangle that has three equal sides and three acute angles called?

• isosceles acute triangle

• equilateral acute triangle

• scalene acute triangle

Multiple Choice

How many right angles does a right triangle have?

• one right angle

• 2 right angles

• no right angles

Multiple Choice

What is an isosceles triangle?

• a triangle that has 2 equal sides.

• a triangle that has a right angle.

• a triangle that has 3 equal sides and 3 acute angles.

Multiple Choice

What is a triangle that has no equal sides called?

• acute triangle

• equilateral triangle

• scalene triangle

Let's practice!

Open your book pages 829-830.

Fill in the Blanks

Page 829 Q7

Classify each triangle by its sides, and then by its angles.

Fill in the Blanks

Page 829 Q8

Classify each triangle by its sides, and then by its angles.

Fill in the Blanks

Page 829 Q9

Classify each triangle by its sides, and then by its angles.

Fill in the Blanks

Page 829 Q10

Classify each triangle by its sides, and then by its angles.

Fill in the Blanks

Page 829 Q11

Classify each triangle by its sides, and then by its angles.

Fill in the Blanks

Page 829 Q12

Classify each triangle by its sides, and then by its angles.

Fill in the Blanks

Page 829 Q13

Classify each triangle by its sides, and then by its angles.

Fill in the Blanks

Page 829 Q14

Classify each triangle by its sides, and then by its angles.

Fill in the Blanks

Page 829 Q15

Classify each triangle by its sides, and then by its angles.

Fill in the Blanks

Page 830 Q19

Mitch draws a triangle with one obtuse angle.

What are all the possible ways to classify the triangle by its angle measures and side lengths? Explain.

Open Ended

Page 830 Q20

Draw each triangle in its correct angle classification.

Tell which triangles are acute, obtuse and right.

Poll

SELF ASSESSMENT

How well did you do in this lesson's practice?

• 😞 I am very confused! I can't do it by myself!

• 🤔 I am still confused! I need some help!

• 😉 I can do it by myself, but I make some mistakes!

• 😍 I can do it without mistakes & I can help other!