Classifying Triangles Subject: Geometry Grade Level: 7th grade

Antonetti Triangle Notes Fold page in ½ Students will take notes on one side and draw on the other.

Where can you find TRIANGLES? Watch Animoto video!

Properties of TRIANGLES? Watch Discovery Ed video!

Two Ways to Classify Triangles Classify by “Sides” Scalene Isosceles Equilaterial Classify by “Angles”

Classifying Triangles By Their Sides Scalene Isosceles Equilateral

No sides are the same length Scalene Triangles No sides are the same length

At least two sides are the same length Isosceles Triangles At least two sides are the same length

Equilateral Triangles All sides are the same length

Two Ways to Classify Triangles Classify by “Sides” Scalene Isosceles Equilaterial Classify by “Angles” Acute Right Obtuse

Classifying Triangles By Their Angles Acute Right Obtuse

Acute triangles have three acute angles

Right triangles have One right angle

Obtuse triangles have ONE obtuse angle

Classify this triangle. Right Scalene

Classify this triangle. - Obtuse Isosceles

Classify this triangle. Acute Scalene

Classify this triangle. Acute Isosceles

Classify this triangle. Obtuse Scalene

The sum of the measures of any triangle is 180°. Triangle Degrees The sum of the measures of any triangle is 180°. What is the measure of x? 70° x

Triangle Degrees What is the measure of x? 45° x

Triangle Degrees x What is the measure of x? 60° 50°

Side Measures Draw triangles given 3 side measures. “You Want Me to Do What?!” Worksheet

Angle Measures Protractor Practice: How to Use a Protractor Independent Practice measuring angles and constructing angles Construct triangles given (3) angle measures. “Construct Triangles with Angle Measures” worksheet

Classification by Angles Classification by Sides Create Your Own On a Scrap sheet of paper you need to: Draw 3 triangles 3 Different Sizes - Very Precise Measure Sides and Angles (Label) Put in a chart (See my example) Classify Each triangle according to your notes. Triangle <1 <2 <3 Sum Classification by Angles Side 1 Side 2 Side 3 Classification by Sides 1 2 3

Classifying Quadrilaterals

Quadrilateral Flowchart Give Student’s a copy of Flowchart… Brainstorm with your partner: Use the word bank to complete the Flowchart? Rectangle Rhombus Trapezoid Quadrilateral Parallelogram Square

Quadrilateral Flowchart

What is a quadrilateral? A quadrilateral is a closed 2 dimensional figure with FOUR (4) line segments.

What is a parallelogram? Opposite sides congruent Opposite sides parallel

What is a rectangle? Four right angles.

What is a rhombus? Four congruent sides.

What is a square? 4 right angles 4 sides congruent

What is a trapezoid? Exactly one pair of parallel sides

What are all of the names for this polygon? Quadrilateral Parallelogram Rectangle Which name best describes the shape?

What are all of the names for this polygon? Quadrilateral Parallelogram Which name best describes the shape?

What are all of the names for this polygon? Quadrilateral Parallelogram Rhombus Which name best describes the shape?

What are all of the names for this polygon? Quadrilateral Trapezoid Which name best describes the shape?

What are all of the names for this polygon? Quadrilateral Parallelogram Square Rhombus Rectangle Which name best describes the shape?